# Statewide opinion polling for the 2020 Democratic Party presidential primaries

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This is a list of statewide public opinion polls that have been conducted relating to the Democratic primaries for the 2020 United States presidential election. The persons named in the polls are declared candidates or have received media speculation about their possible candidacy.
Given the large number of potential candidates, the scores of certain low-polling and infrequently-polled candidates have been combined within the "other" column; their exact scores may be viewed by viewing the footnotes associated with each poll. The polls included are among Democrats or Democrats and Democratic-leaning independents, and do not include Republican-leaning independents. The statewide polls are ordered by the scheduled date of the state's primary or caucus. Open-ended polls are included and marked with an asterisk (*), but closed-ended versions of such polls are listed where possible. If multiple versions of polls are provided, the version used for debate qualification is prioritized, then the version among likely voters, then registered voters, then adults.

## Background

The Democratic National Committee has determined that candidates may qualify for the first two Democratic primary debates either by polling at 1% or higher in at least three national or early-state (Iowa, New Hampshire, Nevada, and South Carolina) polls sponsored or conducted by designated organizations (in different regions if by the same organization) published after January 1, 2019, up until June 12, 2019, or by a fundraising threshold requiring at least 65,000 unique donors with at least 200 in 20 different states. Should more than 20 candidates meet either threshold, then candidates meeting both thresholds will be given highest priority for entry into the debates, followed by those with the highest polling average and those with the most donors. The pollsters and sponsors of polls designated for consideration by the DNC are the Associated Press, ABC News, CBS News, CNN, The Des Moines Register, Fox News, the Las Vegas Review-Journal, Monmouth University, NBC News, The New York Times, National Public Radio, Quinnipiac University, Reuters, the University of New Hampshire, USA Today, The Wall Street Journal, The Washington Post, and Winthrop University. Open-ended polls do not count towards the polling threshold.
For the third and fourth primary debates, candidates will be required to meet both polling and fundraising thresholds, with the prior considering only polls between June 28 and August 28, 2019, and increased to 4 qualifying polls at 2% support, now excluding surveys sponsored by the Las Vegas Review-Journal and Reuters; the latter requirement has also been increased, to 130,000 unique donors with at least 400 in 20 different states.
Individuals who have been included in national Democratic primary polls but have either ruled out their candidacy or not expressed interest in running include Stacey Abrams, Michael Avenatti, Sherrod Brown, Hillary Clinton, Mark Cuban, Andrew Cuomo, Al Franken, Eric Garcetti, Tim Kaine, Jason Kander, Joe Kennedy III, John Kerry, Mitch Landrieu, Terry McAuliffe, Chris Murphy, Gavin Newsom, Michelle Obama, Howard Schultz, Oprah Winfrey, and Mark Zuckerberg.

## Polling in the four early primary states

The following Morning Consult weekly poll archive graph depicts the evolution of the standing of each candidate in the early primary states (Iowa, New Hampshire, Nevada and South Carolina) since February 2019.

## Polling for Super Tuesday

The following Morning Consult graph depicts the evolution of the standing of each candidate in the March 3, 2020 Super Tuesday states (Alabama, Arkansas, California, Colorado, Maine, Massachusetts, Minnesota, North Carolina, Oklahoma, Tennessee, Texas, Utah, Vermont, and Virginia) since January 7, 2020.

## Primary and caucus calendar

The following dates reflect either the confirmed or expected dates of Democratic primaries and caucuses in 2020. Those for contests in U.S. territories with no date yet set are based on dates estimated by The Green Papers based on past years. The pledged delegate numbers listed below are based on the presidential votes in 2008, 2012, and 2016, as well as the number of electoral votes of each state in 2020. The number of DNC members and distinguished party leaders in the count of unpledged PLEO (party leaders and elected officials) delegates is based on the 2016 Democratic National Convention, while the number of unpledged officeholders (governors, members of Congress, and their equivalents in non-state jurisdictions) reflects their current total. The numbers of pledged delegates do not yet account for delegate bonuses or penalties from timing or clustering.
States listed with a lavender background and an asterisk (*) do not yet have a date set by existing statute. States with a light yellow background and a dagger (†) are set to shift their primary or caucus date following the expected passage of legislation moving the dates of their contests. If not already listed as such, the date to which the contest is expected to be moved is listed in parentheses. Party-run primaries (also described as either a firehouse primary or caucus in some jurisdictions) are listed with two asterisks (**).
2020 Democratic Primaries and Caucuses :
| Date | State/territory | Type | Eligibility | P | U | T |
| Feb 3 | Iowa | Caucus | Closed | 41 | 8 | 49 |
| Feb 11 | New Hampshire | Primary | Mixed | 24 | 9 | 33 |
| Feb 22 | Nevada | Caucus | Closed | 36 | 12 | 48 |
| Feb 29 | South Carolina | Primary | Open | 54 | 9 | 63 |
| Mar 3 | Alabama | Primary | Open | 52 | 9 | 61 |
| Mar 3 | American Samoa* | Caucus | Open | 6 | 5 | 11 |
| Mar 3 | Arkansas | Primary | Open | 31 | 5 | 36 |
| Mar 3 | California | Primary | Mixed | 416 | 79 | 495 |
| Mar 3 | Colorado | Primary | Mixed | 67 | 13 | 80 |
| Mar 3 | Maine | Primary | Closed | 24 | 8 | 32 |
| Mar 3 | Massachusetts | Primary | Mixed | 91 | 23 | 114 |
| Mar 3 | Minnesota | Primary | Closed | 75 | 17 | 92 |
| Mar 3 | North Carolina | Primary | Mixed | 110 | 12 | 122 |
| Mar 3 | Oklahoma | Primary | Mixed | 37 | 5 | 42 |
| Mar 3 | Tennessee | Primary | Open | 64 | 9 | 73 |
| Mar 3 | Texas | Primary | Closed | 228 | 34 | 262 |
| Mar 3 | Utah | Primary | Mixed | 29 | 6 | 35 |
| Mar 3 | Vermont | Primary | Open | 16 | 7 | 23 |
| Mar 3 | Virginia | Primary | Open | 99 | 25 | 124 |
| Mar 3–10 | Democrats Abroad | Caucus** | Open | 13 | 4 | 17 |
| Mar 10 | Idaho | Primary | Closed | 20 | 5 | 25 |
| Mar 10 | Michigan | Primary | Open | 125 | 22 | 147 |
| Mar 10 | Mississippi | Primary | Open | 36 | 5 | 41 |
| Mar 10 | Missouri | Primary | Open | 68 | 10 | 78 |
| Mar 10 | North Dakota | Caucus** | Open | 14 | 4 | 18 |
| Mar 10 | Washington | Primary | Closed | 89 | 18 | 107 |
| Mar 14 | Northern Marianas* | Caucus | Closed | 6 | 5 | 11 |
| Mar 17 | Arizona | Primary | Closed | 67 | 11 | 78 |
| Mar 17 | Florida | Primary | Closed | 219 | 29 | 248 |
| Mar 17 | Illinois | Primary | Open | 155 | 29 | 184 |
| Apr 7 | Wisconsin | Primary | Open | 84 | 13 | 90 |
| Apr 10 | Alaska | Primary** | Closed | 15 | 4 | 18 |
| Apr 17 | Wyoming | Caucus | Closed | 13 | 4 | 17 |
| Apr 28 | Ohio | Primary | Mixed | 136 | 17 | 153 |
| May 2 | Guam* | Caucus | Closed | 7 | 5 | 11 |
| May 2 | Kansas | Primary** | Closed | 39 | 6 | 39 |
| May 12 | Nebraska | Primary | Mixed | 29 | 4 | 29 |
| May 19 | Oregon | Primary | Closed | 61 | 14 | 66 |
| May 22 | Hawaii | Primary** | Closed | 24 | 9 | 31 |
| Jun 2 | Delaware | Primary | Closed | 21 | 11 | 28 |
| Jun 2 | District of Columbia† | Primary | Closed | 20 | 26 | 43 |
| Jun 2 | Indiana | Primary | Open | 82 | 7 | 77 |
| Jun 2 | Maryland | Primary | Closed | 96 | 23 | 102 |
| Jun 2 | Montana | Primary | Open | 19 | 6 | 22 |
| Jun 2 | New Mexico | Primary | Closed | 34 | 11 | 40 |
| Jun 2 | Pennsylvania | Primary | Closed | 186 | 23 | 176 |
| Jun 2 | Rhode Island | Primary | Mixed | 26 | 9 | 30 |
| Jun 2 | South Dakota | Primary | Mixed | 16 | 5 | 19 |
| Jun 6 | Virgin Islands* | Caucus | Closed | 7 | 6 | 13 |
| Jun 9 | Georgia | Primary | Open | 105 | 15 | 120 |
| Jun 9 | West Virginia | Primary | Mixed | 28 | 6 | 30 |
| Jun 23 | Kentucky | Primary | Closed | 54 | 6 | 52 |
| Jun 23 | New York† | Primary | Closed | 273 | 46 | 270 |
| Jul 7 | New Jersey | Primary | Mixed | 126 | 21 | 128 |
| Jul 11 | Louisiana | Primary | Closed | 54 | 7 | 57 |
| Jul 12 | Puerto Rico | Primary | Open | 51 | 8 | 59 |
| Aug 11 | Connecticut | Primary | Closed | 60 | 15 | 64 |
| N/A | Unassigned | – | – | – | 1 | 1 |
| Total delegates | Total delegates | Total delegates | Total delegates | 3,979 | 765 | 4,744 |

## Iowa caucus

The Iowa Democratic caucus was held on February 3, 2020.
Polling aggregation :
| Source of poll aggregation | Date updated | Dates polled | Bernie Sanders | Joe Biden | Pete Buttigieg | Elizabeth Warren | Amy Klobuchar | Andrew Yang | Tom Steyer | Other | Un- decided |
| 270 to Win | Feb 3, 2020 | Jan 22 – Feb 2, 2020 | 22.6% | 18.2% | 15.2% | 15.6% | 11.8% | 3.8% | 3.6% | 3.6% | 5.6% |
| RealClear Politics | Feb 3, 2020 | Jan 20 – Feb 2, 2020 | 23.0% | 19.3% | 16.8% | 15.5% | 9.0% | 3.3% | 3.0% | 2.5% | 7.6% |
| FiveThirtyEight | Feb 3, 2020 | until Feb 2, 2020 | 22.2% | 20.7% | 15.7% | 14.5% | 10.1% | 3.7% | 3.6% | 2.9% | 6.6% |
| Average | Average | Average | 22.6% | 19.4% | 15.9% | 15.2% | 10.3% | 3.6% | 3.4% | 3.0% | 6.6% |
The results of a final poll from The Des Moines Register were not released as scheduled on February 1, after an interviewee complained that Pete Buttigieg was not given as a poll option during their interview, with the omission reportedly attributed to human error. As the polling firm was unable to determine whether the mistake was an isolated incident or not, pollster Ann Selzer decided to withhold the results of the poll altogether, marking the first time in 76 years that the final pre-caucus poll was not released by the Register. The poll was later leaked on Twitter, with results confirmed by FiveThirtyEight showing Sanders in the lead with 22%, followed by Warren with 18%, Buttigieg with 16% and Biden with 13%.
Polling from December 1, 2019, to February 3, 2020 :
| Poll source | Date(s) administered | Sample size | Margin of error | Joe Biden | Pete Buttigieg | Tulsi Gabbard | Amy Klobuchar | Bernie Sanders | Tom Steyer | Elizabeth Warren | Andrew Yang | Other | Undecided |
| Emerson College | Jan 30 – Feb 2, 2020 | 853 (LV) | ± 3.3% | 21% | 15% | 1% | 11% | 28% | 4% | 14% | 5% | 2% | – |
| Data for Progress | Jan 28 – Feb 2, 2020 | 2,394 (LV) | ± 1.6% | 24% | 22% | – | – | 28% | – | 25% | – | – | – |
| Data for Progress | Jan 28 – Feb 2, 2020 | 2,394 (LV) | ± 1.6% | 18% | 18% | 2% | 9% | 22% | 4% | 19% | 6% | 2% | – |
| YouGov/CBS News (MRP) | Jan 22–31, 2020 | 1,835 (RV) | ± 3% | 25% | 21% | | 5% | 25% | | 16% | | | |
| David Binder Research/Focus on Rural America | Jan 28–30, 2020 | 300 (LV) | ± 5.7% | 46% | – | – | – | 40% | – | – | – | – | 14% |
| David Binder Research/Focus on Rural America | Jan 28–30, 2020 | 300 (LV) | ± 5.7% | 15% | 19% | 3% | 11% | 17% | 3% | 15% | 1% | 2% | 12% |
| American Research Group | Jan 27–30, 2020 | 400 (LV) | ± 4.0% | 17% | 9% | 2% | 16% | 23% | 3% | 15% | 5% | 4% | 6% |
| Civiqs/Data for Progress | Jan 26–29, 2020 | 615 (LV) | ± 4.7% | 20% | 18% | 1% | 0% | 31% | 2% | 25% | 1% | 1% | 2% |
| Civiqs/Data for Progress | Jan 26–29, 2020 | 615 (LV) | ± 4.7% | 15% | 15% | 2% | 8% | 28% | 2% | 21% | 5% | 0% | 2% |
| Park Street Strategies | Jan 24–28, 2020 | 600 (LV) | ± 3.0% | 20% | 17% | 1% | 12% | 18% | 4% | 17% | 5% | <1% | 6% |
| Monmouth University | Jan 23–27, 2020 | 544 (LV) | ± 4.2% | 29% | 20% | – | – | 25% | – | 19% | – | 1% | 6% |
| Monmouth University | Jan 23–27, 2020 | 544 (LV) | ± 4.2% | 22% | 17% | – | 12% | 22% | – | 16% | 5% | <1% | 6% |
| Monmouth University | Jan 23–27, 2020 | 544 (LV) | ± 4.2% | 23% | 16% | 1% | 10% | 21% | 4% | 15% | 3% | 1% | 5% |
| Civiqs/Iowa State University | Jan 23–27, 2020 | 655 (LV) | ± 4.8% | 15% | 17% | 2% | 11% | 24% | 4% | 19% | 5% | 2% | 3% |
| Emerson College | Jan 23–26, 2020 | 450 (LV) | ± 4.6% | 21% | 10% | 5% | 13% | 30% | 5% | 11% | 5% | 2% | – |
| Suffolk University/USA Today | Jan 23–26, 2020 | 500 (LV) | ± 4.4% | 25.4% | 17.6% | 0.8% | 5.6% | 18.6% | 2.2% | 13.2% | 3.0% | 13.6% | – |
| Change Research/Crooked Media | Jan 22–26, 2020 | 704 (LV) | ± 3.7% | 22% | 23% | – | – | 30% | – | 20% | – | – | 5% |
| Change Research/Crooked Media | Jan 22–26, 2020 | 704 (LV) | ± 3.7% | 18% | 19% | 1% | 10% | 27% | 4% | 15% | 4% | 2% | – |
| Siena College/New York Times | Jan 20–23, 2020 | 584 (LV) | ± 4.8% | 23% | 23% | – | – | 30% | – | 19% | – | – | 8% |
| Siena College/New York Times | Jan 20–23, 2020 | 584 (LV) | ± 4.8% | 17% | 18% | 1% | 8% | 25% | 3% | 15% | 3% | 1% | 8% |
| Morningside College | Jan 17–23, 2020 | 253 (LV) | ± 6.2% | 19% | 18% | 3% | 12% | 15% | 6% | 15% | 4% | 2% | 4% |
| YouGov/CBS News | Jan 16–23, 2020 | 1401 (RV) | ± 3.9% | 25% | 22% | 0% | 7% | 26% | 1% | 15% | 1% | 2% | 1% |
| Civiqs/Data for Progress | Jan 19–21, 2020 | 590 (LV) | ± 4.8% | 17% | 19% | 2% | 6% | 24% | 3% | 19% | 5% | 0% | 5% |
| David Binder Research/Focus on Rural America | Jan 15–18, 2020 | 500 (LV) | ± 4.4% | 24% | 16% | 1% | 11% | 14% | 4% | 18% | 3% | 2% | – |
| Neighbourhood Research and Media/Breitbart | Jan 14–17, 2020 | 300 (LV) | ± 4.8% | 23% | 17% | – | 11% | 10% | 2% | 15% | 2% | 6% | 13% |
| | Jan 13, 2020 | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race |
| Monmouth University | Jan 9–12, 2020 | 405 (LV) | ± 4.9% | 28% | 25% | – | – | 24% | – | 16% | – | 2% | 4% |
| Monmouth University | Jan 9–12, 2020 | 405 (LV) | ± 4.9% | 24% | 17% | 2% | 8% | 18% | 4% | 15% | 4% | 4% | 5% |
| Selzer/CNN/Des Moines Register | January 2–8, 2020 | 701 (LV) | ± 3.7% | 15% | 16% | 2% | 6% | 20% | 2% | 17% | 5% | 2% | 11% |
| YouGov/CBS News | Dec 27, 2019 – Jan 3, 2020 | 953 (RV) | ± 3.8% | 23% | 23% | 1% | 7% | 23% | 2% | 16% | 2% | 2% | 1% |
| KG Polling | Dec 19–23, 2019 | 750 (LV) | ± 3.8% | 24% | 12% | – | 5% | 31% | – | 13% | 10% | – | 5% |
| Civiqs/Iowa State University | Dec 12–16, 2019 | 632 (LV) | ± 4.9% | 15% | 24% | 3% | 4% | 21% | 2% | 18% | 3% | 4% | 4% |
| Emerson College | Dec 7–10, 2019 | 325 (LV) | ± 5.4% | 23% | 18% | 2% | 10% | 22% | 3% | 12% | 2% | 8% | – |
| | Dec 3, 2019 | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race |
Polling during November 2019 :
| Poll source | Date(s) administered | Sample size | Margin of error | Joe Biden | Pete Buttigieg | Tulsi Gabbard | Kamala Harris | Amy Klobuchar | Bernie Sanders | Tom Steyer | Elizabeth Warren | Andrew Yang | Other | Undecided |
| Civiqs/Iowa State University | Nov 15–19, 2019 | 614 (LV) | ± 4.9% | 12% | 26% | 2% | 2% | 5% | 18% | 2% | 19% | 4% | 6% | 3% |
| Des Moines Register/CNN | Nov 8–13, 2019 | 500 (LV) | ± 4.4% | 15% | 25% | 3% | 3% | 6% | 15% | 3% | 16% | 3% | 6% | 5% |
| YouGov/CBS News | Nov 6–13, 2019 | 856 (RV) | ± 4.1% | 22% | 21% | 0% | 5% | 5% | 22% | 2% | 18% | 1% | 4% | – |
| Monmouth University | Nov 7–11, 2019 | 451 (LV) | ± 4.6% | 19% | 22% | 2% | 3% | 5% | 13% | 3% | 18% | 3% | 6% | 8% |
| University of Iowa | Oct 28 – Nov 10, 2019 | 465 (LV) | ± 4.6% | 15% | 16% | 3% | 2% | 1% | 18% | 3% | 23% | 3% | 2% | 13% |
| Public Policy Polling | Nov 5–6, 2019 | 715 (LV) | – | 13% | 20% | – | 3% | 9% | 14% | 6% | 21% | 3% | – | 10% |
| Quinnipiac University | Oct 30 – Nov 5, 2019 | 698 (LV) | ± 4.5% | 15% | 19% | 3% | 4% | 5% | 17% | 3% | 20% | 3% | 4% | 8% |
| | Nov 1, 2019 | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race |
Polling before November 2019 :
| Poll source | Date(s) administered | Sample size | Margin of error | Joe Biden | Cory Booker | Pete Buttigieg | Kamala Harris | Amy Klobuchar | Beto O'Rourke | Bernie Sanders | Elizabeth Warren | Other | Undecided |
| Siena College/New York Times | Oct 25–30, 2019 | 439 (LV) | ± 4.7% | 17% | 2% | 18% | 3% | 4% | 1% | 19% | 22% | 8% | 6% |
| Civiqs/Iowa State University | Oct 18–22, 2019 | 598 (LV) | ± 5% | 12% | 1% | 20% | 3% | 4% | 1% | 18% | 28% | 8% | 4% |
| Suffolk University/USA Today | Oct 16–18, 2019 | 500 (LV) | ± 4.4% | 18% | 1% | 13% | 3% | 3% | 1% | 9% | 17% | 7% | 29% |
| Emerson College | Oct 13–16, 2019 | 317 (LV) | ± 5.5% | 23% | 3% | 16% | 2% | 1% | 0% | 13% | 23% | 15% | – |
| Firehouse Strategies/Øptimus | Oct 8–10, 2019 | 548 (LV) | ± 3.6% | 22% | 2% | 17% | 3% | – | 1% | 5% | 25% | 26% | – |
| YouGov/CBS News | Oct 3–11, 2019 | 729 (RV) | ± 4.6% | 22% | 2% | 14% | 5% | 2% | 2% | 21% | 22% | 7% | – |
| Selzer/CNN/Des Moines Register | Sep 14–18, 2019 | 602 (LV) | ± 4.0% | 20% | 3% | 9% | 6% | 3% | 2% | 11% | 22% | 11% | 14% |
| David Binder Research | Sep 14–17, 2019 | 500 (LV) | ± 4.4% | 25% | 2% | 12% | 5% | 8% | 1% | 9% | 23% | 9% | 6% |
| Civiqs/Iowa State University | Sep 13–17, 2019 | 572 (LV) | ± 5.2% | 16% | 2% | 13% | 5% | 3% | 2% | 16% | 24% | 11% | 8% |
| YouGov/CBS News | Aug 28 – Sep 4, 2019 | 835 | ± 4.3% | 29% | 2% | 7% | 6% | 2% | 2% | 26% | 17% | 9% | – |
| Change Research | Aug 9–11, 2019 | 621 (LV) | ± 3.9% | 17% | 3% | 13% | 8% | 2% | 3% | 17% | 28% | 9% | – |
| Monmouth University | Aug 1–4, 2019 | 401 (LV) | ± 4.9% | 28% | 1% | 8% | 11% | 3% | <1% | 9% | 19% | 11% | 10% |
| Firehouse Strategies/Øptimus | Jul 23–25, 2019 | 630 | ± 3.3% | 23% | 2% | 7% | 12% | – | 2% | 11% | 23% | 4% | 16% |
| YouGov/CBS News | Jul 9–18, 2019 | 706 | ± 4.4% | 24% | 3% | 7% | 16% | 4% | 1% | 19% | 17% | 9% | – |
| | Jul 9, 2019 | Steyer announces his candidacy | Steyer announces his candidacy | Steyer announces his candidacy | Steyer announces his candidacy | Steyer announces his candidacy | Steyer announces his candidacy | Steyer announces his candidacy | Steyer announces his candidacy | Steyer announces his candidacy | Steyer announces his candidacy | Steyer announces his candidacy | Steyer announces his candidacy |
| Change Research | Jun 29 – Jul 4, 2019 | 420 (LV) | – | 16% | 1% | 25% | 16% | 1% | 2% | 16% | 18% | 5% | – |
| David Binder Research | Jun 29 – Jul 1, 2019 | 600 | ± 4.0% | 17% | 2% | 10% | 18% | 4% | 1% | 12% | 20% | 9% | 9% |
| Suffolk University/USA Today | Jun 28 – Jul 1, 2019 | 500 | ± 4.4% | 24% | 2% | 6% | 16% | 2% | 1% | 9% | 13% | 6% | 21% |
| Change Research | Jun 17–20, 2019 | 308 (LV) | – | 27% | 5% | 17% | 4% | 2% | 1% | 18% | 20% | 7% | – |
| Selzer/CNN/Des Moines Register | Jun 2–5, 2019 | 600 | ± 4.0% | 24% | 1% | 14% | 7% | 2% | 2% | 16% | 15% | 6% | 6% |
| Change Research | May 15–19, 2019 | 615 (LV) | ± 3.9% | 24% | 1% | 14% | 10% | 2% | 5% | 24% | 12% | 9% | – |
| Firehouse Strategies/Øptimus | Apr 30 – May 2, 2019 | 576 | ± 4.1% | 35% | 2% | 11% | 5% | 4% | 3% | 14% | 10% | – | 16% |
| | Apr 25, 2019 | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy |
| Gravis Marketing | Apr 17–18, 2019 | 590 | ± 4.0% | 19% | 4% | 14% | 6% | 4% | 5% | 19% | 6% | 7% | 16% |
| | Apr 14, 2019 | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy |
| Monmouth University | Apr 4–9, 2019 | 351 | ± 5.2% | 27% | 3% | 9% | 7% | 4% | 6% | 16% | 7% | 7% | 12% |
| David Binder Research | Mar 21–24, 2019 | 500 | ± 4.4% | 25% | 7% | 6% | 9% | 6% | 6% | 17% | 8% | 9% | 7% |
| Emerson College | Mar 21–24, 2019 | 249 | ± 6.2% | 25% | 6% | 11% | 10% | 2% | 5% | 24% | 9% | 8% | – |
| Public Policy Polling (D) | Mar 14–15, 2019 | 678 | – | 29% | 4% | – | 5% | 6% | 7% | 15% | 8% | 4% | 22% |
| | Mar 14, 2019 | O'Rourke announces his candidacy | O'Rourke announces his candidacy | O'Rourke announces his candidacy | O'Rourke announces his candidacy | O'Rourke announces his candidacy | O'Rourke announces his candidacy | O'Rourke announces his candidacy | O'Rourke announces his candidacy | O'Rourke announces his candidacy | O'Rourke announces his candidacy | O'Rourke announces his candidacy | O'Rourke announces his candidacy |
| Selzer/CNN/Des Moines Register | Mar 3–6, 2019 | 401 | ± 4.9% | 27% | 3% | 1% | 7% | 3% | 5% | 25% | 9% | 5% | 10% |
| | Feb 19, 2019 | Sanders announces his candidacy | Sanders announces his candidacy | Sanders announces his candidacy | Sanders announces his candidacy | Sanders announces his candidacy | Sanders announces his candidacy | Sanders announces his candidacy | Sanders announces his candidacy | Sanders announces his candidacy | Sanders announces his candidacy | Sanders announces his candidacy | Sanders announces his candidacy |
| | Feb 10, 2019 | Klobuchar announces her candidacy | Klobuchar announces her candidacy | Klobuchar announces her candidacy | Klobuchar announces her candidacy | Klobuchar announces her candidacy | Klobuchar announces her candidacy | Klobuchar announces her candidacy | Klobuchar announces her candidacy | Klobuchar announces her candidacy | Klobuchar announces her candidacy | Klobuchar announces her candidacy | Klobuchar announces her candidacy |
| | Feb 9, 2019 | Warren announces her candidacy | Warren announces her candidacy | Warren announces her candidacy | Warren announces her candidacy | Warren announces her candidacy | Warren announces her candidacy | Warren announces her candidacy | Warren announces her candidacy | Warren announces her candidacy | Warren announces her candidacy | Warren announces her candidacy | Warren announces her candidacy |
| Firehouse Strategies/Øptimus | Jan 31 – Feb 2, 2019 | 558 | ± 3.6% | 25% | 4% | – | 17% | 5% | 4% | 10% | 11% | 1% | 25% |
| Emerson College | Jan 30 – Feb 2, 2019 | 260 | ± 6.0% | 29% | 4% | 0% | 18% | 3% | 6% | 15% | 11% | 15% | – |
| | Feb 1, 2019 | Booker announces his candidacy | Booker announces his candidacy | Booker announces his candidacy | Booker announces his candidacy | Booker announces his candidacy | Booker announces his candidacy | Booker announces his candidacy | Booker announces his candidacy | Booker announces his candidacy | Booker announces his candidacy | Booker announces his candidacy | Booker announces his candidacy |
| | Jan 21, 2019 | Harris announces her candidacy | Harris announces her candidacy | Harris announces her candidacy | Harris announces her candidacy | Harris announces her candidacy | Harris announces her candidacy | Harris announces her candidacy | Harris announces her candidacy | Harris announces her candidacy | Harris announces her candidacy | Harris announces her candidacy | Harris announces her candidacy |
| | Jan 11, 2019 | Gabbard announces her candidacy | Gabbard announces her candidacy | Gabbard announces her candidacy | Gabbard announces her candidacy | Gabbard announces her candidacy | Gabbard announces her candidacy | Gabbard announces her candidacy | Gabbard announces her candidacy | Gabbard announces her candidacy | Gabbard announces her candidacy | Gabbard announces her candidacy | Gabbard announces her candidacy |
| Change Research | Dec 13–17, 2018 | 1,291 (LV) | – | 20% | 4% | – | 7% | 5% | 19% | 20% | 7% | 18% | – |
| Selzer/CNN/Des Moines Register | Dec 10–13, 2018 | 455 | ± 4.6% | 32% | 4% | – | 5% | 3% | 11% | 19% | 8% | 7% | 6% |
| David Binder Research | Dec 10–11, 2018 | 500 | ± 4.4% | 30% | 6% | – | 7% | 10% | 11% | 13% | 9% | 8% | 6% |
| David Binder Research | Sep 20–23, 2018 | 500 | ± 4.4% | 37% | 8% | – | 10% | – | – | 12% | 16% | 6% | 9% |
| | Nov 6, 2017 | Yang announces his candidacy | Yang announces his candidacy | Yang announces his candidacy | Yang announces his candidacy | Yang announces his candidacy | Yang announces his candidacy | Yang announces his candidacy | Yang announces his candidacy | Yang announces his candidacy | Yang announces his candidacy | Yang announces his candidacy | Yang announces his candidacy |
| Public Policy Polling (D) | Mar 3–6, 2017 | 1,062 | – | – | 17% | – | 3% | 11% | – | – | – | 34% | 32% |

## New Hampshire primary

The New Hampshire Democratic primary was held on February 11, 2020.
Polling aggregation :
| Source of poll aggregation | Date updated | Dates polled | Bernie Sanders | Pete Buttigieg | Elizabeth Warren | Joe Biden | Amy Klobuchar | Andrew Yang | Tulsi Gabbard | Tom Steyer | Other | Un- decided |
| 270 to Win | Feb 10, 2020 | Feb 4–9, 2020 | 27.3% | 20.9% | 13.1% | 12.3% | 10.3% | 3.0% | 2.7% | 2.1% | 1.9% | 6.4% |
| RealClear Politics | Feb 10, 2020 | Feb 6–9, 2020 | 28.7% | 21.3% | 11.0% | 11.0% | 11.7% | 3.7% | 3.3% | 1.7% | 1.3% | 6.3% |
| FiveThirtyEight | Feb 10, 2020 | until Feb 10, 2020 | 26.0% | 21.6% | 12.5% | 11.7% | 10.3% | 3.0% | 2.9% | 2.6% | 3.5% | 5.8% |
| Average | Average | Average | 27.3% | 21.3% | 12.2% | 11.7% | 10.8% | 3.2% | 3.0% | 2.1% | 2.2% | 6.2% |
| New Hampshire primary results (February 11, 2020) | New Hampshire primary results (February 11, 2020) | New Hampshire primary results (February 11, 2020) | 25.6% | 24.3% | 9.2% | 8.4% | 19.7% | 2.8% | 3.3% | 3.6% | 2.7% | – |
Polling from January 1, 2020, to February 11, 2020 :
| Poll source | Date(s) administered | Sample size | Margin of error | Joe Biden | Pete Buttigieg | Tulsi Gabbard | Amy Klobuchar | Bernie Sanders | Tom Steyer | Elizabeth Warren | Andrew Yang | Other | Undecided |
| New Hampshire primary (popular vote) | Feb 11, 2020 | – | – | 8.4% | 24.3% | 3.3% | 19.7% | 25.6% | 3.6% | 9.2% | 2.8% | 2.7% | – |
| AtlasIntel | Feb 8–10, 2020 | 431 (LV) | ± 5.0% | 12% | 24% | 3% | 14% | 24% | 1% | 11% | 5% | – | 6% |
| Data For Progress | Feb 7–10, 2020 | 1296 (LV) | ± 2.7% | 9% | 26% | 3% | 13% | 28% | 3% | 14% | 5% | – | – |
| American Research Group | Feb 8–9, 2020 | 400 (LV) | – | 13% | 20% | 3% | 13% | 28% | 2% | 11% | 3% | 5% | 2% |
| Emerson College/WHDH | Feb 8–9, 2020 | 500 (LV) | ± 4.3% | 10% | 23% | 2% | 14% | 30% | 2% | 11% | 4% | 4% | – |
| Change Research | Feb 8–9, 2020 | 662 (LV) | ± 3.8% | 9% | 21% | 6% | 8% | 30% | 3% | 8% | 5% | 1% | 9% |
| Suffolk University/Boston Globe/WBZ-TV | Feb 8–9, 2020 | 500 (LV) | ± 4.4% | 12% | 19% | 3% | 14% | 27% | 2% | 12% | 3% | 3% | 7% |
| Elucd | Feb 7–9, 2020 | 492 (LV) | ± 4.4% | 8% | 20% | – | 12% | 26% | – | 10% | – | – | 15% |
| University of New Hampshire/CNN | Feb 6–9, 2020 | 365 (LV) | ± 5.1% | 11% | 22% | 5% | 7% | 29% | 1% | 10% | 4% | 1% | 10% |
| Emerson College/WHDH | Feb 7–8, 2020 | 500 (LV) | ± 4.3% | 11% | 20% | 3% | 13% | 30% | 2% | 12% | 4% | 4% | – |
| Suffolk University/Boston Globe/WBZ-TV | Feb 7–8, 2020 | 500 (LV) | ± 4.4% | 10% | 22% | 2% | 9% | 24% | 2% | 13% | 3% | 3% | 12% |
| Boston Herald/FPU/NBC10 | Feb 5–8, 2020 | 512 (LV) | – | 14% | 20% | 0% | 6% | 23% | 2% | 16% | 3% | 3% | 13% |
| YouGov/CBS News | Feb 5–8, 2020 | 848 (LV) | ± 4.3% | 12% | 25% | 2% | 10% | 29% | 1% | 17% | 1% | 3% | – |
| University of New Hampshire/CNN | Feb 5–8, 2020 | 384 (LV) | ± 5.0% | 12% | 21% | 5% | 6% | 28% | 2% | 9% | 4% | 2% | 11% |
| Emerson College/WHDH | Feb 6–7, 2020 | 500 (LV) | ± 4.3% | 11% | 24% | 5% | 9% | 31% | 2% | 11% | 3% | 3% | – |
| Suffolk University/Boston Globe/WBZ-TV | Feb 6–7, 2020 | 500 (LV) | ± 4.4% | 11% | 25% | 2% | 6% | 24% | 2% | 14% | 3% | 4% | 9% |
| University of Massachusetts Lowell | Feb 4–7, 2020 | 440 (LV) | ± 6.5% | 14% | 17% | 4% | 8% | 25% | 5% | 15% | 3% | 5% | 4% |
| University of New Hampshire/CNN | Feb 4–7, 2020 | 365 (LV) | ± 5.1% | 11% | 21% | 6% | 5% | 28% | 3% | 9% | 3% | 3% | 11% |
| Emerson College/WHDH | Feb 5–6, 2020 | 500 (LV) | ± 4.3% | 11% | 23% | 6% | 9% | 32% | 2% | 13% | 2% | 3% | – |
| Suffolk University/Boston Globe/WBZ-TV | Feb 5–6, 2020 | 500 (LV) | ± 4.4% | 11% | 23% | 4% | 6% | 24% | 3% | 13% | 3% | 4% | 12% |
| Marist/NBC News | Feb 4–6, 2020 | 709 (LV) | ± 4.7% | 13% | 21% | 3% | 8% | 25% | 4% | 14% | 4% | 3% | 5% |
| Suffolk University/Boston Globe/WBZ-TV | Feb 4–5, 2020 | 500 (LV) | ± 4.4% | 12% | 19% | 5% | 6% | 25% | 4% | 11% | 2% | 1% | 15% |
| Monmouth University | Feb 3–5, 2020 | 503 (LV) | ± 4.4% | 17% | 20% | 4% | 9% | 24% | 3% | 13% | 4% | 2% | 5% |
| Monmouth University | Feb 3–5, 2020 | 503 (LV) | ± 4.4% | 17% | 22% | – | 13% | 27% | – | 13% | – | 3% | 4% |
| Monmouth University | Feb 3–5, 2020 | 503 (LV) | ± 4.4% | 19% | 28% | – | – | 28% | – | 16% | – | 3% | 5% |
| Emerson College/WHDH | Feb 3–5, 2020 | 500 (LV) | ± 4.3% | 12% | 21% | 5% | 11% | 31% | 1% | 12% | 4% | 2% | – |
| Suffolk University/Boston Globe/WBZ-TV | Feb 3–4, 2020 | 500 (LV) | ± 4.4% | 15% | 15% | 5% | 6% | 24% | 5% | 10% | 3% | 1% | 14% |
| Emerson College/WHDH | Feb 2–4, 2020 | 500 (LV) | ± 4.3% | 13% | 17% | 6% | 11% | 32% | 2% | 11% | 6% | 3% | – |
| | Feb 3, 2020 | Iowa caucuses | Iowa caucuses | Iowa caucuses | Iowa caucuses | Iowa caucuses | Iowa caucuses | Iowa caucuses | Iowa caucuses | Iowa caucuses | Iowa caucuses | Iowa caucuses | Iowa caucuses |
| Suffolk University/Boston Globe/WBZ-TV | Feb 2–3, 2020 | 500 (LV) | ± 4.4% | 18% | 11% | 5% | 6% | 24% | 4% | 13% | 3% | 3% | 14% |
| Emerson College/WHDH | Feb 1–3, 2020 | 500 (LV) | ± 4.3% | 13% | 12% | 4% | 12% | 32% | 5% | 13% | 5% | 4% | – |
| Emerson College/WHDH | Jan 31 – Feb 2, 2020 | 500 (LV) | ± 4.3% | 14% | 13% | 7% | 8% | 29% | 8% | 12% | 7% | 2% | – |
| Saint Anselm College | Jan 29 – Feb 2, 2020 | 491 (LV) | ± 4.4% | 19% | 14% | 3% | 11% | 19% | 5% | 11% | 4% | 2% | 11% |
| Boston Herald/FPU/NBC10 | Jan 29 – Feb 1, 2020 | 454 (LV) | ± 4.6% | 24% | 8% | 3% | 4% | 31% | No voters | 17% | 1% | 5% | 7% |
| University of Massachusetts Lowell | Jan 28–31, 2020 | 400 (LV) | ± 6.4% | 22% | 12% | 5% | 6% | 23% | 6% | 19% | 2% | 1% | 4% |
| YouGov/UMass Amherst/WCVB | Jan 17–29, 2020 | 500 (LV) | ± 5.3% | 20% | 12% | 5% | 5% | 25% | 5% | 17% | 4% | 2% | 3% |
| American Research Group | Jan 24–27, 2020 | 600 (LV) | ± 4% | 13% | 12% | 8% | 7% | 28% | 2% | 11% | 5% | 8% | 6% |
| Boston Herald/FPU/NBC10 | Jan 23–26, 2020 | 407 (LV) | ± 4.9% | 22% | 10% | 3% | 5% | 29% | 0% | 16% | 1% | 7% | 9% |
| Marist/NBC News | Jan 20–23, 2020 | 697 (LV) | ± 4.5% | 15% | 17% | 6% | 10% | 22% | 3% | 13% | 5% | 2% | 7% |
| University of New Hampshire/CNN | Jan 15–23, 2020 | 516 (LV) | ± 4.3% | 16% | 15% | 5% | 6% | 25% | 2% | 12% | 5% | 2% | 10% |
| MassINC Polling Group/WBUR | Jan 17–21, 2020 | 426 (LV) | ± 4.8% | 14% | 17% | 5% | 6% | 29% | 2% | 13% | 5% | 4% | 5% |
| Suffolk University/Boston Globe | Jan 15–19, 2020 | 500 (LV) | ± 4.4% | 15% | 12% | 5% | 5% | 16% | 3% | 10% | 6% | 3% | 24% |
| Emerson College/WHDH | Jan 13–16, 2020 | 657 (LV) | ± 3.8% | 14% | 18% | 5% | 10% | 23% | 4% | 14% | 6% | 7% | – |
| | Jan 13, 2020 | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race |
| Boston Herald/FPU/NBC10 | Jan 8–12, 2020 | 434 (LV) | – | 26% | 7% | 4% | 2% | 22% | 2% | 18% | 2% | 7% | 12% |
| Patinkin Research Strategies/Yang 2020 | Jan 5–7, 2020 | 600 (LV) | ± 4% | 21% | 17% | 7% | 6% | 19% | 6% | 10% | 5% | 3% | 7% |
| Monmouth University | Jan 3–7, 2020 | 404 (LV) | ± 4.9% | 19% | 20% | 4% | 6% | 18% | 4% | 15% | 3% | 3% | 7% |
| Monmouth University | Jan 3–7, 2020 | 404 (LV) | ± 4.9% | 21% | 20% | – | 7% | 21% | – | 15% | 5% | 5% | 8% |
| Monmouth University | Jan 3–7, 2020 | 404 (LV) | ± 4.9% | 24% | 23% | – | – | 21% | – | 18% | – | 5% | 8% |
| YouGov/CBS News | Dec 27, 2019 – Jan 3, 2020 | 487 (LV) | ± 5.3% | 25% | 13% | 1% | 7% | 27% | 3% | 18% | 2% | 3% | – |
Polling before January 2020 :
| Poll source | Date(s) administered | Sample size | Margin of error | Joe Biden | Cory Booker | Pete Buttigieg | Tulsi Gabbard | Kamala Harris | Amy Klobuchar | Beto O'Rourke | Deval Patrick | Bernie Sanders | Elizabeth Warren | Andrew Yang | Other | Undecided |
| MassINC Polling Group/WBUR | Dec 3–8, 2019 | 442 (LV) | ± 4.7% | 17% | 1% | 18% | 5% | – | 3% | – | <1% | 15% | 12% | 5% | 11% | 12% |
| | Dec 3, 2019 | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race |
| Emerson College | Nov 22–26, 2019 | 549 (LV) | ± 4.1% | 14% | 2% | 22% | 6% | 4% | 2% | – | 0% | 26% | 14% | 5% | 7% | – |
| Boston Globe/Suffolk University | Nov 21–24, 2019 | 500 (LV) | – | 12% | 2% | 13% | 6% | 3% | 1% | – | 1% | 16% | 14% | 4% | 6% | 21% |
| Saint Anselm College | Nov 13–18, 2019 | 255 (RV) | ± 6.1% | 15% | 3% | 25% | 3% | 1% | 6% | – | 0% | 9% | 15% | 2% | 5% | 13% |
| | Nov 14, 2019 | Patrick announces his candidacy | Patrick announces his candidacy | Patrick announces his candidacy | Patrick announces his candidacy | Patrick announces his candidacy | Patrick announces his candidacy | Patrick announces his candidacy | Patrick announces his candidacy | Patrick announces his candidacy | Patrick announces his candidacy | Patrick announces his candidacy | Patrick announces his candidacy | Patrick announces his candidacy | Patrick announces his candidacy | Patrick announces his candidacy |
| YouGov/CBS News | Nov 6–13, 2019 | 535 (RV) | ± 5% | 22% | 1% | 16% | 0% | 3% | 3% | – | – | 20% | 31% | 1% | 1% | – |
| Quinnipiac University | Nov 6–10, 2019 | 1,134 (LV) | ± 3.8 | 20% | 1% | 15% | 6% | 1% | 3% | – | – | 14% | 16% | 4% | 5% | 14% |
| | Nov 1, 2019 | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race |
| University of New Hampshire/CNN | Oct 21–27, 2019 | 574 (LV) | ± 4.1% | 15% | 2% | 10% | 5% | 3% | 5% | 2% | – | 21% | 18% | 5% | 4% | 10% |
| Boston Herald/FPU | Oct 9–13, 2019 | 422 (LV) | ± 4.8% | 24% | 2% | 9% | 1% | 4% | 2% | 0% | – | 22% | 25% | 1% | 4% | 7% |
| Firehouse Strategies/Øptimus | Oct 8–10, 2019 | 610 (LV) | ± 3.7% | 18% | 2% | 7% | – | 2% | – | 1% | – | 9% | 25% | 2% | 32% | – |
| YouGov/CBS News | Oct 3–11, 2019 | 506 | ± 5.4% | 24% | 1% | 7% | 2% | 4% | 2% | 1% | – | 17% | 32% | 5% | 5% | – |
| Saint Anselm College | Sep 25–29, 2019 | 423 | ± 4.8% | 24% | 1% | 10% | 3% | 5% | 3% | <1% | – | 11% | 25% | 2% | 3% | 9% |
| Monmouth University | Sep 17–21, 2019 | 401 | ± 4.9% | 25% | 2% | 10% | 2% | 3% | 2% | 1% | – | 12% | 27% | 2% | 3% | 9% |
| HarrisX/No Labels | Sep 6–11, 2019 | 595 | ± 4.0% | 22% | 3% | 5% | 6% | 5% | 1% | 1% | – | 21% | 15% | 2% | 5% | 14% |
| Boston Herald/FPU | Sep 4–10, 2019 | 425 | ± 4.8% | 21% | 1% | 5% | 3% | 6% | 1% | 2% | – | 29% | 17% | 5% | 2% | 9% |
| Emerson College | Sep 6–9, 2019 | 483 | ± 4.4% | 24% | 4% | 11% | 6% | 8% | 1% | 1% | – | 13% | 21% | 3% | 7% | – |
| YouGov/CBS News | Aug 28 – Sep 4, 2019 | 526 | ± 5.2% | 26% | 2% | 8% | 1% | 7% | 1% | 1% | – | 25% | 27% | 1% | 1% | – |
| Gravis Marketing | Aug 2–6, 2019 | 250 | ± 6.2% | 15% | 0% | 8% | 5% | 7% | 4% | 2% | – | 21% | 12% | 4% | 8% | 11% |
| Suffolk University | Aug 1–4, 2019 | 500 | ± 4.4% | 21% | 1% | 6% | 3% | 8% | 1% | 0% | – | 17% | 14% | 1% | 6% | 21% |
| Firehouse Strategies/Øptimus | Jul 23–25, 2019 | 587 | ± 3.3% | 21% | 1% | 8% | – | 13% | – | 0% | – | 13% | 16% | 1% | 7% | 19% |
| YouGov/CBS News | Jul 9–18, 2019 | 530 | ± 5% | 27% | 1% | 7% | 2% | 12% | 1% | 2% | – | 20% | 18% | 1% | 5% | – |
| University of New Hampshire/CNN | Jul 8–15, 2019 | 386 | ± 5.0% | 24% | 2% | 10% | 1% | 9% | 0% | 2% | – | 19% | 19% | 1% | 4% | 9% |
| Saint Anselm College | Jul 10–12, 2019 | 351 | ± 5.2% | 21% | 1% | 12% | 1% | 18% | 3% | 0% | – | 10% | 17% | 5% | 3% | 11% |
| Change Research | Jul 6–9, 2019 | 1,084 | ± 3.0% | 19% | 1% | 13% | 3% | 15% | 1% | 1% | – | 20% | 22% | 1% | 3% | – |
| Change Research | Jun 29 – Jul 4, 2019 | 420 | – | 13% | 2% | 14% | 2% | 13% | 1% | 2% | – | 26% | 24% | 2% | 4% | – |
| Change Research | Jun 17–20, 2019 | 308 | – | 24% | 0% | 14% | 1% | 3% | 1% | 4% | – | 28% | 21% | 1% | 3% | – |
| YouGov/CBS News | May 31 – Jun 12, 2019 | 502 | ± 4.9% | 33% | 3% | 10% | 0% | 7% | 1% | 4% | – | 20% | 17% | 1% | 2% | – |
| Tel Opinion Research* | May 20–22, 2019 | 600 | ± 4.0% | 33% | – | 7% | – | 7% | – | 1% | – | 12% | 11% | – | – | 28% |
| Monmouth University | May 2–7, 2019 | 376 | ± 5.1% | 36% | 2% | 9% | 0% | 6% | 2% | 2% | – | 18% | 8% | 1% | 2% | 11% |
| Change Research | May 3–5, 2019 | 864 | ± 3.3% | 26% | 2% | 12% | 1% | 8% | 1% | 3% | – | 30% | 9% | 2% | 4% | – |
| Firehouse Strategies/Øptimus | Apr 30 – May 2, 2019 | 551 | ± 4.0% | 34% | 1% | 10% | – | 7% | 1% | 3% | – | 16% | 9% | – | – | 19% |
| Suffolk University | Apr 25–28, 2019 | 429 | ± 4.7% | 20% | 3% | 12% | 1% | 6% | 1% | 3% | – | 12% | 8% | 1% | 4% | 27% |
| | Apr 25, 2019 | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy |
| University of New Hampshire | Apr 10–18, 2019 | 241 | ± 6.3% | 18% | 3% | 15% | 1% | 4% | 2% | 3% | – | 30% | 5% | 2% | 5% | 12% |
| | Apr 14, 2019 | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy |
| Saint Anselm College | Apr 3–8, 2019 | 326 | ± 5.4% | 23% | 4% | 11% | 1% | 7% | 2% | 6% | – | 16% | 9% | – | 9% | 13% |
| | Mar 14, 2019 | O'Rourke announces his candidacy | O'Rourke announces his candidacy | O'Rourke announces his candidacy | O'Rourke announces his candidacy | O'Rourke announces his candidacy | O'Rourke announces his candidacy | O'Rourke announces his candidacy | O'Rourke announces his candidacy | O'Rourke announces his candidacy | O'Rourke announces his candidacy | O'Rourke announces his candidacy | O'Rourke announces his candidacy | O'Rourke announces his candidacy | O'Rourke announces his candidacy | O'Rourke announces his candidacy |
| University of New Hampshire | Feb 18–26, 2019 | 240 | ± 6.3% | 22% | 3% | 1% | 1% | 10% | 4% | 5% | – | 26% | 7% | – | 6% | 14% |
| Emerson College | Feb 21–22, 2019 | 405 | ± 4.8% | 25% | 5% | 1% | – | 12% | 8% | 5% | – | 27% | 9% | – | 10% | – |
| | Feb 19, 2019 | Sanders announces his candidacy | Sanders announces his candidacy | Sanders announces his candidacy | Sanders announces his candidacy | Sanders announces his candidacy | Sanders announces his candidacy | Sanders announces his candidacy | Sanders announces his candidacy | Sanders announces his candidacy | Sanders announces his candidacy | Sanders announces his candidacy | Sanders announces his candidacy | Sanders announces his candidacy | Sanders announces his candidacy | Sanders announces his candidacy |
| YouGov/UMass Amherst | Feb 7–15, 2019 | 337 | ± 6.4% | 28% | 3% | – | – | 14% | 1% | 6% | – | 20% | 9% | – | 9% | 9% |
| | Feb 10, 2019 | Klobuchar announces her candidacy | Klobuchar announces her candidacy | Klobuchar announces her candidacy | Klobuchar announces her candidacy | Klobuchar announces her candidacy | Klobuchar announces her candidacy | Klobuchar announces her candidacy | Klobuchar announces her candidacy | Klobuchar announces her candidacy | Klobuchar announces her candidacy | Klobuchar announces her candidacy | Klobuchar announces her candidacy | Klobuchar announces her candidacy | Klobuchar announces her candidacy | Klobuchar announces her candidacy |
| | Feb 9, 2019 | Warren announces her candidacy | Warren announces her candidacy | Warren announces her candidacy | Warren announces her candidacy | Warren announces her candidacy | Warren announces her candidacy | Warren announces her candidacy | Warren announces her candidacy | Warren announces her candidacy | Warren announces her candidacy | Warren announces her candidacy | Warren announces her candidacy | Warren announces her candidacy | Warren announces her candidacy | Warren announces her candidacy |
| Firehouse Strategies/Øptimus | Jan 31 – Feb 2, 2019 | 518 | ± 4.1% | 22% | 4% | – | – | 13% | 2% | 2% | – | 13% | 9% | – | 0% | 35% |
| | Feb 1, 2019 | Booker announces his candidacy | Booker announces his candidacy | Booker announces his candidacy | Booker announces his candidacy | Booker announces his candidacy | Booker announces his candidacy | Booker announces his candidacy | Booker announces his candidacy | Booker announces his candidacy | Booker announces his candidacy | Booker announces his candidacy | Booker announces his candidacy | Booker announces his candidacy | Booker announces his candidacy | Booker announces his candidacy |
| | Jan 21, 2019 | Harris announces her candidacy | Harris announces her candidacy | Harris announces her candidacy | Harris announces her candidacy | Harris announces her candidacy | Harris announces her candidacy | Harris announces her candidacy | Harris announces her candidacy | Harris announces her candidacy | Harris announces her candidacy | Harris announces her candidacy | Harris announces her candidacy | Harris announces her candidacy | Harris announces her candidacy | Harris announces her candidacy |
| | Jan 11, 2019 | Gabbard announces her candidacy | Gabbard announces her candidacy | Gabbard announces her candidacy | Gabbard announces her candidacy | Gabbard announces her candidacy | Gabbard announces her candidacy | Gabbard announces her candidacy | Gabbard announces her candidacy | Gabbard announces her candidacy | Gabbard announces her candidacy | Gabbard announces her candidacy | Gabbard announces her candidacy | Gabbard announces her candidacy | Gabbard announces her candidacy | Gabbard announces her candidacy |
| Change Research | Jan 2–3, 2019 | 1,162 | – | 24% | 3% | – | – | 4% | 2% | 9% | – | 26% | 11% | – | 22% | – |
| University of New Hampshire | Aug 2–19, 2018 | 198 | ± 7.0% | 19% | 6% | – | – | 3% | – | – | – | 30% | 17% | – | 12% | 12% |
| Suffolk University | Apr 26–30, 2018 | 295 | ± 5.7% | 20% | 8% | – | – | 4% | – | – | 4% | 13% | 26% | – | 4% | 18% |
| Suffolk University | Apr 26–30, 2018 | 295 | ± 5.7% | 30% | 10% | – | – | 6% | – | – | 8% | 25% | – | – | 6% | 12% |
| University of New Hampshire | Apr 13–22, 2018 | 188 | ± 7.1% | 26% | 5% | – | – | 6% | 1% | – | – | 28% | 11% | – | 9% | 13% |
| University of New Hampshire | Jan 28 – Feb 10, 2018 | 219 | ± 6.6% | 35% | 3% | – | – | 1% | 0% | – | – | 24% | 15% | – | 7% | 15% |
| | Nov 6, 2017 | Yang announces his candidacy | Yang announces his candidacy | Yang announces his candidacy | Yang announces his candidacy | Yang announces his candidacy | Yang announces his candidacy | Yang announces his candidacy | Yang announces his candidacy | Yang announces his candidacy | Yang announces his candidacy | Yang announces his candidacy | Yang announces his candidacy | Yang announces his candidacy | Yang announces his candidacy | Yang announces his candidacy |
| University of New Hampshire | Oct 3–15, 2017 | 212 | ± 6.7% | 24% | 6% | – | – | 1% | 1% | – | – | 31% | 13% | – | 14% | 11% |
Head-to-head polls :
| Poll source | Date(s) administered | Sample size | Margin of error | Joe Biden | Pete Buttigieg | Bernie Sanders | Elizabeth Warren | Undecided |
| Tel Opinion Research | May 20–22, 2019 | 600 | ± 4.0% | 63% | 21% | – | – | 15% |
| Tel Opinion Research | May 20–22, 2019 | 600 | ± 4.0% | 66% | – | 22% | – | 13% |
| Tel Opinion Research | May 20–22, 2019 | 600 | ± 4.0% | 58% | – | – | 29% | 13% |
| American Research Group | Mar 21–27, 2018 | 400 | ± 5.0% | 47% | – | 45% | – | 7% |
| American Research Group | Mar 21–27, 2018 | 400 | ± 5.0% | 58% | – | – | 33% | 8% |

## Nevada caucus

The Nevada Democratic caucus was held on February 22, 2020.
Polling aggregation :
| Source of poll aggregation | Date updated | Dates polled | Bernie Sanders | Joe Biden | Pete Buttigieg | Elizabeth Warren | Tom Steyer | Amy Klobuchar | Others | Undecided |
| 270 to Win | Feb 21, 2020 | Feb 14–21, 2020 | 30.0% | 16.7% | 14.0% | 13.7% | 9.7% | 9.7% | 1.3% | 4.9% |
| RealClear Politics | Feb 21, 2020 | Feb 19–21, 2020 | 32.5% | 16.0% | 16.0% | 14.0% | 9.0% | 9.5% | 2.0% | 1.0% |
| FiveThirtyEight | Feb 21, 2020 | until Feb 21, 2020 | 30.5% | 14.4% | 15.3% | 11.8% | 10.2% | 8.9% | 11.0% | – |
| Average | Average | Average | 31.0% | 15.7% | 15.1% | 13.2% | 9.6% | 9.4% | 4.7% | 2.0% |
| Nevada caucus results, first alignment (February 22, 2020) | Nevada caucus results, first alignment (February 22, 2020) | Nevada caucus results, first alignment (February 22, 2020) | 34.0% | 17.6% | 15.4% | 12.8% | 9.1% | 9.6% | 1.5% | – |
Tabulation of individual polls of the 2020 Nevada Democratic Caucus :
| Poll source | Date(s) administered | Sample size | Margin of error | Joe Biden | Cory Booker | Pete Buttigieg | Kamala Harris | Amy Klobuchar | Beto O'Rourke | Bernie Sanders | Tom Steyer | Elizabeth Warren | Andrew Yang | Other | Undecided |
| Nevada caucuses (first alignment vote) | Feb 22, 2020 | – | – | 17.6% | – | 15.4% | – | 9.6% | – | 34% | 9.1% | 12.8% | 0.6% | 1% | – |
| Data for Progress | Feb 19–21, 2020 | 1010 (LV) | ± 2.8% | 16% | – | 15% | – | 8% | – | 35% | 8% | 16% | – | 2% | – |
| AtlasIntel | Feb 19–21, 2020 | 517 (LV) | ± 4.0% | 11% | – | 14% | – | 5% | – | 38% | 11% | 9% | – | 7% | 5% |
| Emerson College | Feb 19–20, 2020 | 425 (LV) | ± 4.7% | 16% | – | 17% | – | 11% | – | 30% | 10% | 12% | – | 4% | – |
| | Feb 15–18, 2020 | Early voting occurred in the Nevada caucuses | Early voting occurred in the Nevada caucuses | Early voting occurred in the Nevada caucuses | Early voting occurred in the Nevada caucuses | Early voting occurred in the Nevada caucuses | Early voting occurred in the Nevada caucuses | Early voting occurred in the Nevada caucuses | Early voting occurred in the Nevada caucuses | Early voting occurred in the Nevada caucuses | Early voting occurred in the Nevada caucuses | Early voting occurred in the Nevada caucuses | Early voting occurred in the Nevada caucuses | Early voting occurred in the Nevada caucuses | Early voting occurred in the Nevada caucuses |
| Point Blank Political | Feb 13–15, 2020 | 256 (LV) | ± 5.6% | 14.3% | – | 12.6% | – | 15.6% | – | 13% | 18.6% | 7.1% | – | 1.7% | 17.1% |
| Beacon Research/Tom Steyer | Feb 12–15, 2020 | 600 (LV) | – | 19% | – | 13% | – | 7% | – | 24% | 18% | 10% | – | 4% | 6% |
| Data for Progress | Feb 12–15, 2020 | 766 (LV) | ± 3.4% | 14% | – | 15% | – | 9% | – | 35% | 10% | 16% | – | 2% | – |
| WPA Intelligence/Las Vegas Review-Journal/AARP Nevada | Feb 11–13, 2020 | 413 (LV) | ± 4.8% | 18% | – | 10% | – | 10% | – | 25% | 11% | 13% | – | 5% | 8% |
| | Feb 11, 2020 | New Hampshire primary; Yang withdraws from the race after close of polls | New Hampshire primary; Yang withdraws from the race after close of polls | New Hampshire primary; Yang withdraws from the race after close of polls | New Hampshire primary; Yang withdraws from the race after close of polls | New Hampshire primary; Yang withdraws from the race after close of polls | New Hampshire primary; Yang withdraws from the race after close of polls | New Hampshire primary; Yang withdraws from the race after close of polls | New Hampshire primary; Yang withdraws from the race after close of polls | New Hampshire primary; Yang withdraws from the race after close of polls | New Hampshire primary; Yang withdraws from the race after close of polls | New Hampshire primary; Yang withdraws from the race after close of polls | New Hampshire primary; Yang withdraws from the race after close of polls | New Hampshire primary; Yang withdraws from the race after close of polls | New Hampshire primary; Yang withdraws from the race after close of polls |
| | Jan 13, 2020 | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race |
| Suffolk University/USA Today | Jan 8–11, 2020 | 500 (LV) | ± 4.4% | 19% | 2% | 8% | – | 4% | – | 18% | 8% | 11% | 4% | 4% | 22% |
| https://www.yang2020.com/wp-content/uploads/Myers-Research-Nevada.pdf Archived January 11, 2020, at the Wayback Machine | Jan 5–8, 2020 | 635 | ± 4.0% | 23% | 3% | 6% | – | 2% | – | 17% | 12% | 12% | 4% | 13% | 6% |
| | Dec 3, 2019 | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race |
| YouGov/CBS News | Nov 6–13, 2019 | 708 (RV) | ± 4.7% | 33% | 2% | 9% | 4% | 2% | – | 23% | 2% | 21% | 1% | 2% | – |
| Fox News | Nov 10–13, 2019 | 627 | ± 4.0% | 24% | 1% | 8% | 4% | 2% | – | 18% | 5% | 18% | 3% | 4% | 10% |
| Emerson Polling | Oct 31 – Nov 2, 2019 | 451 (LV) | ± 4.6% | 30% | 1% | 5% | 5% | 1% | – | 19% | 3% | 22% | 5% | 10% | – |
| Mellman Group/The Nevada Independent | Oct 28 – Nov 2, 2019 | 600 (LV) | ± 4.0% | 29% | 1% | 7% | 3% | 3% | 0% | 19% | 4% | 19% | 3% | 3% | 9% |
| | Nov 1, 2019 | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race |
| CNN/SSRS | Sep 22–26, 2019 | 324 (LV) | ± 7.1% | 22% | 2% | 4% | 5% | 1% | 0% | 22% | 4% | 18% | 3% | 3% | 13% |
| Suffolk University/USA Today | Sep 19–23, 2019 | 500 (LV) | – | 23% | 2% | 3% | 4% | 0% | 1% | 14% | 3% | 19% | 3% | 4% | 21% |
| YouGov/CBS News | Aug 28 – Sep 4, 2019 | 563 (LV) | ± 4.9% | 27% | 1% | 4% | 6% | 0% | 3% | 29% | 2% | 18% | 1% | 9% | – |
| Gravis Marketing | Aug 14–16, 2019 | 382 (RV) | ± 5.0% | 25% | 3% | 5% | 9% | 2% | 0% | 10% | 6% | 15% | 2% | 13% | 9% |
| Change Research | Aug 2–8, 2019 | 439 (LV) | ± 4.7% | 26% | 0% | 7% | 10% | 1% | 2% | 22% | 3% | 23% | 1% | 5% | – |
| Morning Consult | Jul 1–21, 2019 | 749 (RV) | ± 4.0% | 29% | 3% | 6% | 11% | 1% | 3% | 23% | 1% | 12% | 3% | 10% | – |
| | Jul 9, 2019 | Steyer announces his candidacy | Steyer announces his candidacy | Steyer announces his candidacy | Steyer announces his candidacy | Steyer announces his candidacy | Steyer announces his candidacy | Steyer announces his candidacy | Steyer announces his candidacy | Steyer announces his candidacy | Steyer announces his candidacy | Steyer announces his candidacy | Steyer announces his candidacy | Steyer announces his candidacy | Steyer announces his candidacy |
| Monmouth University | Jun 6–11, 2019 | 370 (LV) | ± 5.1% | 36% | 2% | 7% | 6% | 1% | 2% | 13% | – | 19% | 2% | 3% | 8% |
| Change Research | May 9–12, 2019 | 389 (LV) | – | 29% | 2% | 13% | 11% | 1% | 4% | 24% | – | 12% | 1% | 4% | – |
| | Apr 25, 2019 | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy |
| | Apr 14, 2019 | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy |
| Emerson College | Mar 28–30, 2019 | 310 (LV) | ± 5.5% | 26% | 2% | 5% | 9% | 2% | 10% | 23% | – | 10% | 3% | 9% | – |

## South Carolina primary

The South Carolina Democratic primary was held on February 29, 2020.
Polling aggregation :
| Source of poll aggregation | Date updated | Dates polled | Joe Biden | Bernie Sanders | Tom Steyer | Pete Buttigieg | Elizabeth Warren | Amy Klobuchar | Tulsi Gabbard | Un- decided |
| 270 to Win | Feb 28, 2020 | Feb 23–27, 2020 | 35.8% | 20.2% | 13.4% | 10.0% | 8.2% | 5.0% | 2.6% | 4.8% |
| RealClear Politics | Feb 28, 2020 | Feb 23–27, 2020 | 39.7% | 24.3% | 11.7% | 11.3% | 6.0% | 5.7% | 2.3% | – |
| FiveThirtyEight | Feb 28, 2020 | until Feb 27, 2020 | 38.4% | 19.1% | 12.4% | 8.5% | 7.0% | 4.3% | 2.6% | 7.7% |
| Average | Average | Average | 38.0% | 21.2% | 12.5% | 9.9% | 7.1% | 5.0% | 2.5% | 4.9% |
| South Carolina primary results (February 29, 2020) | South Carolina primary results (February 29, 2020) | South Carolina primary results (February 29, 2020) | 48.7% | 19.8% | 11.3% | 8.2% | 7.1% | 3.1% | 1.3% | – |
Polling in January and February 2020 :
| Poll source | Date(s) administered | Sample size | Margin of error | Joe Biden | Michael Bloomberg | Pete Buttigieg | Tulsi Gabbard | Amy Klobuchar | Bernie Sanders | Tom Steyer | Elizabeth Warren | Andrew Yang | Other | Undecided |
| South Carolina primary (popular vote) | Feb 29, 2020 | – | – | 48.65% | – | 8.2% | 1.26% | 3.13% | 19.77% | 11.34% | 7.07% | 0.2% | 0.38% | – |
| Atlas Intel | Feb 25–28, 2020 | 477 (LV) | ± 4.0% | 35% | – | 8% | 2% | 4% | 24% | 12% | 7% | – | 2% | 6% |
| Emerson College | Feb 26–27, 2020 | 550 (LV) | ± 4.1% | 41% | – | 11% | 2% | 6% | 25% | 11% | 5% | – | – | – |
| Trafalgar Group | Feb 26–27, 2020 | 1,081 (LV) | ± 2.99% | 43.9% | – | 9.6% | 1.7% | 5.9% | 22.8% | 10.5% | 5.6% | – | – | – |
| Data for Progress | Feb 23–27, 2020 | 1416 (LV) | ± 2.6% | 34% | – | 13% | 3% | 5% | 25% | 13% | 7% | – | – | – |
| Change Research / Post and Courier | Feb 23–27, 2020 | 543 (LV) | ± 5.1% | 28% | – | 11% | 5% | 4% | 24% | 16% | 12% | – | – | 1% |
| Starboard Communications | Feb 26, 2020 | 1,102 (LV) | ± 2.82% | 40% | – | 9% | 2% | 6% | 11% | 12% | 9% | – | – | 12% |
| | Feb 25, 2020 | Tenth Democratic primary debate | Tenth Democratic primary debate | Tenth Democratic primary debate | Tenth Democratic primary debate | Tenth Democratic primary debate | Tenth Democratic primary debate | Tenth Democratic primary debate | Tenth Democratic primary debate | Tenth Democratic primary debate | Tenth Democratic primary debate | Tenth Democratic primary debate | Tenth Democratic primary debate | Tenth Democratic primary debate | Tenth Democratic primary debate |
| Monmouth University | Feb 23–25, 2020 | 454 (LV) | ± 4.6% | 36% | – | 6% | 1% | 4% | 16% | 15% | 8% | – | 0% | 15% |
| Clemson University | Feb 17–25, 2020 | 650 (LV) | ± 3.8% | 35% | – | 8% | 2% | 4% | 13% | 17% | 8% | – | – | 12% |
| East Carolina University | Feb 23–24, 2020 | 1,142 (LV) | ± 3.37% | 31% | – | 6% | 2% | 2% | 23% | 20% | 8% | – | – | 8% |
| Public Policy Polling | Feb 23–24, 2020 | 866 (LV) | ± 3.3% | 36% | – | 7% | 6% | 3% | 21% | 7% | 8% | – | – | 11% |
| | Feb 22, 2020 | Nevada caucuses | Nevada caucuses | Nevada caucuses | Nevada caucuses | Nevada caucuses | Nevada caucuses | Nevada caucuses | Nevada caucuses | Nevada caucuses | Nevada caucuses | Nevada caucuses | Nevada caucuses | Nevada caucuses |
| YouGov/CBS News | Feb 20–22, 2020 | 1,238 (LV) | ± 5.5% | 28% | – | 10% | 1% | 4% | 23% | 18% | 12% | – | 3% | 1% |
| Marist Poll/NBC News | Feb 18–21, 2020 | 539 (LV) | ± 6.0% | 27% | – | 9% | 3% | 5% | 23% | 15% | 8% | – | 2% | 9% |
| Marist Poll/NBC News | Feb 18–21, 2020 | 997 (RV) | ± 4.0% | 25% | – | 9% | 3% | 5% | 24% | 15% | 8% | – | 2% | 9% |
| Winthrop University | Feb 9–19, 2020 | 443 (LV) | ± 4.7% | 24% | – | 7% | 1% | 4% | 19% | 15% | 6% | 1% | 2% | 22% |
| University of Massachusetts Lowell | Feb 12–18, 2020 | 400 (LV) | ± 7.5% | 23% | – | 11% | 4% | 9% | 21% | 13% | 11% | – | 4% | 4% |
| Change Research/The Welcome Party | Feb 12–14, 2020 | 1015 (LV) | – | 23% | – | 15% | 1% | 8% | 23% | 20% | 9% | – | – | 1% |
| East Carolina University | Feb 12–13, 2020 | 703 (LV) | ± 4.3% | 28% | 6% | 8% | 1% | 7% | 20% | 14% | 7% | – | 0% | 8% |
| | Feb 11–12, 2020 | New Hampshire primary; Yang withdraws from the race. | New Hampshire primary; Yang withdraws from the race. | New Hampshire primary; Yang withdraws from the race. | New Hampshire primary; Yang withdraws from the race. | New Hampshire primary; Yang withdraws from the race. | New Hampshire primary; Yang withdraws from the race. | New Hampshire primary; Yang withdraws from the race. | New Hampshire primary; Yang withdraws from the race. | New Hampshire primary; Yang withdraws from the race. | New Hampshire primary; Yang withdraws from the race. | New Hampshire primary; Yang withdraws from the race. | New Hampshire primary; Yang withdraws from the race. | New Hampshire primary; Yang withdraws from the race. |
| | Feb 3, 2020 | Iowa caucus | Iowa caucus | Iowa caucus | Iowa caucus | Iowa caucus | Iowa caucus | Iowa caucus | Iowa caucus | Iowa caucus | Iowa caucus | Iowa caucus | Iowa caucus | Iowa caucus |
| Zogby Analytics | Jan 31 – Feb 3, 2020 | 277 (LV) | ± 5.9% | 28% | 4% | 7% | 4% | 2% | 20% | 15% | 11% | 1% | 0% | 8% |
| East Carolina University | Jan 31 – Feb 2, 2020 | 469 (LV) | ± 5.3% | 37% | 1% | 4% | 2% | 2% | 14% | 19% | 8% | 3% | 0% | 10% |
| Change Research/ Post and Courier | Jan 26–29, 2020 | 651 (LV) | ± 4% | 25% | – | 7% | 3% | 2% | 20% | 18% | 11% | 3% | 1% | 10% |
| | Jan 13, 2020 | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race |
| GQR Research/Unite the Country | Jan 9–13, 2020 | 600 (LV) | – | 36% | – | 5% | – | – | 15% | 12% | 10% | – | – | – |
| Fox News | Jan 5–8, 2020 | 808 (RV) | ± 3.5% | 36% | 2% | 4% | 1% | 1% | 14% | 15% | 10% | 2% | 3% | 11% |
Polling before January 2020 :
| Poll source | Date(s) administered | Sample size | Margin of error | Joe Biden | Cory Booker | Pete Buttigieg | Kamala Harris | Beto O'Rourke | Bernie Sanders | Tom Steyer | Elizabeth Warren | Other | Undecided |
| Change Research/ Post and Courier | Dec 6–11, 2019 | 392 (LV) | ± 4.9% | 27% | 5% | 9% | – | – | 20% | 5% | 19% | 13% | – |
| | Dec 3, 2019 | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race |
| YouGov/FairVote | Nov 22 – Dec 2, 2019 | 400 (LV) | ± 7.5% | 39% | 2% | 10% | 2% | – | 13% | 7% | 10% | 13% | 4% |
| Quinnipiac University | Nov 13–17, 2019 | 768 (LV) | ± 4.8% | 33% | 2% | 6% | 3% | – | 11% | 5% | 13% | 7% | 18% |
| YouGov/CBS News | Nov 6–13, 2019 | 933 (RV) | ± 4.2% | 45% | 2% | 8% | 5% | – | 15% | 2% | 17% | 6% | – |
| University of North Florida | Nov 5–13, 2019 | 426 (LV) | – | 36% | 2% | 3% | 4% | – | 10% | 8% | 10% | 6% | 23% |
| | Nov 1, 2019 | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race |
| Monmouth University | Oct 16–21, 2019 | 402 (LV) | ± 4.9% | 33% | 2% | 3% | 6% | 1% | 12% | 4% | 16% | 7% | 15% |
| Change Research/ Post and Courier | Oct 15–21, 2019 | 731 (LV) | ± 3.6% | 30% | 3% | 9% | 11% | 1% | 13% | 5% | 19% | 11% | – |
| Firehouse Strategies/ Øptimus | Oct 8–10, 2019 | 607 (LV) | ± 3.7% | 32% | 2% | 4% | 5% | 1% | 8% | – | 16% | 33% | – |
| YouGov/CBS News | Oct 3–11, 2019 | 915 (RV) | ±3.9% | 43% | 3% | 4% | 7% | 1% | 16% | 2% | 18% | 6% | – |
| Gravis Marketing | Oct 3–7, 2019 | 516 (LV) | ± 4.3% | 34% | 6% | 0% | 4% | 2% | 10% | 7% | 9% | 10% | 19% |
| Fox News | Sep 29 – Oct 2, 2019 | 803 (LV) | ± 3.5% | 41% | 3% | 2% | 4% | 0% | 10% | 4% | 12% | 8% | 16% |
| Winthrop University | Sep 21–30, 2019 | 462 (RV) | ± 4.9% | 37% | 3% | 4% | 7% | 2% | 8% | 2% | 17% | 6% | 12% |
| CNN/SSRS | Sep 22–26, 2019 | 406 (LV) | ± 5.9% | 37% | 2% | 4% | 3% | 2% | 11% | 3% | 16% | 4% | 10% |
| YouGov/CBS News | Aug 28 – Sep 4, 2019 | 849 (RV) | ± 4.3% | 43% | 2% | 4% | 7% | 1% | 18% | 1% | 14% | 9% | – |
| Change Research | Aug 9–12, 2019 | 521 (LV) | ± 4.3% | 36% | 4% | 5% | 12% | 1% | 16% | 1% | 17% | 7% | – |
| Firehouse Strategies/ Øptimus | Jul 23–25, 2019 | 554 (LV) | ± 3.8% | 31% | 2% | 4% | 10% | 0% | 9% | – | 12% | 8% | 24% |
| Monmouth University | Jul 18–22, 2019 | 405 (LV) | ± 4.9% | 39% | 2% | 5% | 12% | 1% | 10% | 2% | 9% | 3% | 17% |
| YouGov/CBS News | Jul 9–18, 2019 | 997 (RV) | ± 3.8% | 39% | 3% | 5% | 12% | 2% | 17% | 1% | 12% | 9% | – |
| Fox News | Jul 7–10, 2019 | 701 (LV) | ± 3.5% | 35% | 3% | 2% | 12% | 0% | 14% | 0% | 5% | 3% | 20% |
| | Jul 9, 2019 | Steyer announces his candidacy | Steyer announces his candidacy | Steyer announces his candidacy | Steyer announces his candidacy | Steyer announces his candidacy | Steyer announces his candidacy | Steyer announces his candidacy | Steyer announces his candidacy | Steyer announces his candidacy | Steyer announces his candidacy | Steyer announces his candidacy | Steyer announces his candidacy |
| Change Research | Jun 29 – Jul 4, 2019 | 421 (LV) | – | 27% | 6% | 6% | 21% | 1% | 16% | 0% | 15% | 8% | – |
| Change Research | Jun 17–20, 2019 | 308 (LV) | – | 39% | 5% | 11% | 9% | 5% | 13% | 0% | 15% | 5% | – |
| Change Research | Jun 11–14, 2019 | 933 (LV) | ± 3.2% | 37% | 5% | 11% | 9% | 4% | 9% | – | 17% | 8% | – |
| YouGov/CBS News | May 31 – Jun 12, 2019 | 552 (LV) | – | 45% | 4% | 6% | 7% | 4% | 18% | – | 8% | 8% | – |
| Zogby Analytics | May 23–29, 2019 | 183 (LV) | ± 7.2% | 36% | 4% | 7% | 4% | 2% | 13% | – | 12% | 4% | – |
| Tel Opinion Research* | May 22–24, 2019 | 600 (LV) | ± 4.0% | 37% | 2% | 3% | 7% | – | 10% | – | 8% | – | 32% |
| Crantford Research | May 14–16, 2019 | 381 (LV) | ± 5.0% | 42% | 4% | 8% | 10% | – | 7% | – | 8% | – | – |
| Change Research | May 6–9, 2019 | 595 (LV) | ± 4.0% | 46% | 4% | 8% | 10% | 2% | 15% | – | 8% | 5% | – |
| Firehouse Strategies/ Øptimus | Apr 30 – May 2, 2019 | 568 (LV) | ± 4.5% | 48% | 4% | 5% | 4% | 1% | 12% | – | 5% | 1% | 20% |
| | Apr 25, 2019 | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy |
| | Apr 14, 2019 | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy |
| Change Research | Mar 31 – Apr 4, 2019 | 744 (LV) | ± 3.6% | 32% | 9% | 7% | 10% | 9% | 14% | – | 6% | 12% | – |
| Change Research | Mar 31 – Apr 4, 2019 | 744 (LV) | ± 3.6% | – | 12% | 12% | 15% | 16% | 24% | – | 11% | 12% | – |
| | Mar 14, 2019 | O'Rourke announces his candidacy | O'Rourke announces his candidacy | O'Rourke announces his candidacy | O'Rourke announces his candidacy | O'Rourke announces his candidacy | O'Rourke announces his candidacy | O'Rourke announces his candidacy | O'Rourke announces his candidacy | O'Rourke announces his candidacy | O'Rourke announces his candidacy | O'Rourke announces his candidacy | O'Rourke announces his candidacy |
| Emerson College | Feb 28 – Mar 2, 2019 | 291 (LV) | ± 5.7% | 37% | 6% | 0% | 9% | 5% | 21% | – | 5% | 16% | – |
| Change Research | Feb 15–18, 2019 | 600 (LV) | ± 4.0% | 36% | 10% | – | 13% | 8% | 14% | – | 9% | 12% | – |
| Change Research | Feb 15–18, 2019 | 600 (LV) | ± 4.0% | – | 28% | 1% | 35% | – | – | – | 20% | 18% | – |
| | Feb 19, 2019 | Sanders announces his candidacy | Sanders announces his candidacy | Sanders announces his candidacy | Sanders announces his candidacy | Sanders announces his candidacy | Sanders announces his candidacy | Sanders announces his candidacy | Sanders announces his candidacy | Sanders announces his candidacy | Sanders announces his candidacy | Sanders announces his candidacy | Sanders announces his candidacy |
| | Feb 9, 2019 | Warren announces her candidacy | Warren announces her candidacy | Warren announces her candidacy | Warren announces her candidacy | Warren announces her candidacy | Warren announces her candidacy | Warren announces her candidacy | Warren announces her candidacy | Warren announces her candidacy | Warren announces her candidacy | Warren announces her candidacy | Warren announces her candidacy |
| Firehouse Strategies/ Øptimus | Jan 31 – Feb 2, 2019 | 557 (LV) | ± 4.0% | 36% | 5% | – | 12% | 2% | 8% | – | 4% | 2% | 31% |
Head-to-head polling :
| Poll source | Date(s) administered | Sample size | Margin of error | Joe Biden | Pete Buttigieg | Bernie Sanders | Elizabeth Warren | Other | Undecided |
| YouGov/FairVote | Nov 22 – Dec 2, 2019 | 400 (LV) | ± 7.5% | 73% | 27% | – | – | – | – |
| YouGov/FairVote | Nov 22 – Dec 2, 2019 | 400 (LV) | ± 7.5% | 66% | – | 34% | – | – | – |
| YouGov/FairVote | Nov 22 – Dec 2, 2019 | 400 (LV) | ± 7.5% | 61% | – | – | 29% | | 6% |
| YouGov/FairVote | Nov 22 – Dec 2, 2019 | 400 (LV) | ± 7.5% | – | 39% | 61% | – | – | – |
| YouGov/FairVote | Nov 22 – Dec 2, 2019 | 400 (LV) | ± 7.5% | – | 36% | – | 64% | – | – |
| YouGov/FairVote | Nov 22 – Dec 2, 2019 | 400 (LV) | ± 7.5% | – | – | 54% | 46% | – | – |
| Tel Opinion Research | May 22–24, 2019 | 600 | ± 4.0% | 71% | 10% | – | – | – | 19% |
| Tel Opinion Research | May 22–24, 2019 | 600 | ± 4.0% | 70% | – | 15% | – | – | 16% |
| Tel Opinion Research | May 22–24, 2019 | 600 | ± 4.0% | 67% | – | – | 15% | – | 18% |

## Alabama primary

The Alabama Democratic primary was held on March 3, 2020.
Polling aggregation :
| Source of poll aggregation | Date updated | Dates polled | Joe Biden | Bernie Sanders | Michael Bloomberg | Elizabeth Warren | Tulsi Gabbard | Other/ Undecided |
| 270 to Win | March 3, 2020 | February 28 – March 2, 2020 | 44.5% | 21.0% | 18.0% | 11.0% | 1.0% | 4.5% |
| RealClear Politics | March 3, 2020 | Insufficient recent polling to supply an average. | Insufficient recent polling to supply an average. | Insufficient recent polling to supply an average. | Insufficient recent polling to supply an average. | Insufficient recent polling to supply an average. | Insufficient recent polling to supply an average. | Insufficient recent polling to supply an average. |
| FiveThirtyEight | March 3, 2020 | until March 2, 2020 | 40.2% | 18.4% | 15.9% | 10.9% | 0.5% | 14.1% |
| Average | Average | Average | 42.35% | 19.7% | 16.95% | 10.95% | 0.75% | 9.3% |
| Alabama primary results (March 3, 2020) | Alabama primary results (March 3, 2020) | Alabama primary results (March 3, 2020) | 63.3% | 16.5% | 11.7% | 5.7% | 0.2% | 2.6% |
Tabulation of individual polls of the 2020 Alabama Democratic Primary :
| Poll source | Date(s) administered | Sample size | Margin of error | Joe Biden | Michael Bloomberg | Cory Booker | Pete Buttigieg | Kamala Harris | Beto O'Rourke | Bernie Sanders | Elizabeth Warren | Other | Undecided |
| | Mar 1–2, 2020 | Buttigieg and Klobuchar withdraw from the race | Buttigieg and Klobuchar withdraw from the race | Buttigieg and Klobuchar withdraw from the race | Buttigieg and Klobuchar withdraw from the race | Buttigieg and Klobuchar withdraw from the race | Buttigieg and Klobuchar withdraw from the race | Buttigieg and Klobuchar withdraw from the race | Buttigieg and Klobuchar withdraw from the race | Buttigieg and Klobuchar withdraw from the race | Buttigieg and Klobuchar withdraw from the race | Buttigieg and Klobuchar withdraw from the race | Buttigieg and Klobuchar withdraw from the race |
| Swayable | Mar 1–2, 2020 | 949 (LV) | ± 5.0% | 42% | 18% | – | 3% | – | – | 20% | 10% | 8% | – |
| Data for Progress | Feb 28 – Mar 2, 2020 | 237 (LV) | ± 6.4% | 47% | 18% | – | – | – | – | 22% | 12% | 2% | – |
| | Jan 13, 2020 | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race |
| | Dec 3, 2019 | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race |
| | Nov 1, 2019 | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race |
| SurveyMonkey | July 2–16, 2019 | 257 | ± 7.8% | 36% | – | 2% | 5% | 13% | 1% | 15% | 9% | 10% | – |
| Change Research | March 20–23, 2019 | 1,200 | ± 2.8% | 42% | – | 9% | 3% | 12% | 10% | 13% | 6% | 4% | – |
| Change Research | March 20–23, 2019 | 1,200 | ± 2.8% | – | – | 14% | 4% | 16% | 17% | 27% | 12% | 9% | – |

## Arkansas primary

The Arkansas Democratic primary was held on March 3, 2020.
Polling Aggregation :
| Source of poll aggregation | Date updated | Dates polled | Joe Biden | Michael Bloomberg | Bernie Sanders | Elizabeth Warren | Tulsi Gabbard | Other/ Undecided |
| 270 to Win | March 3, 2020 | February 6–March 2, 2020 | 27.7% | 22.3% | 18.7% | 11.3% | 0.5% | 19.5% |
| RealClear Politics | March 3, 2020 | Insufficient recent polling to supply an average. | Insufficient recent polling to supply an average. | Insufficient recent polling to supply an average. | Insufficient recent polling to supply an average. | Insufficient recent polling to supply an average. | Insufficient recent polling to supply an average. | Insufficient recent polling to supply an average. |
| FiveThirtyEight | March 3, 2020 | until March 2, 2020 | 27.5% | 21.0% | 18.1% | 12.5% | 0.3% | 20.6% |
| Average | Average | Average | 27.6% | 21.65% | 18.4% | 11.9% | 0.4% | 20.05% |
| Arkansas primary results (March 3, 2020) | Arkansas primary results (March 3, 2020) | Arkansas primary results (March 3, 2020) | 40.5% | 16.7% | 22.4% | 10.0% | 0.7% | 9.7% |
Tabulation of individual polls of the 2020 Arkansas Democratic Primary :
| Poll source | Date(s) administered | Sample size | Margin of error | Joe Biden | Michael Bloomberg | Pete Buttigieg | Bernie Sanders | Elizabeth Warren | Other | Undecided |
| | Mar 1–2, 2020 | Buttigieg and Klobuchar withdraw from the race | Buttigieg and Klobuchar withdraw from the race | Buttigieg and Klobuchar withdraw from the race | Buttigieg and Klobuchar withdraw from the race | Buttigieg and Klobuchar withdraw from the race | Buttigieg and Klobuchar withdraw from the race | Buttigieg and Klobuchar withdraw from the race | Buttigieg and Klobuchar withdraw from the race | Buttigieg and Klobuchar withdraw from the race | Buttigieg and Klobuchar withdraw from the race | Buttigieg and Klobuchar withdraw from the race |
| Swayable | Mar 1–2, 2020 | 714 (LV) | ± 6.0% | 28% | 25% | 8% | 17% | 10% | 13% | – |
| Data for Progress | Feb 28–Mar 2, 2020 | 300 (LV) | ± 5.6% | 36% | 22% | 2% | 23% | 15% | 2% | – |
| The Progress Campaign (D) | Feb 21–25, 2020 | 209 (RV) | ± 4.9% | 17% | 17% | 18% | 19% | 12% | 6% | 10% |
| Hendrix College/Talk Business & Politics | February 6–7, 2020 | 496 (LV) | ± 4.3% | 18.5% | 19.6% | 15.5% | 16.4% | 8.9% | 10.1% | 11% |

## California primary

The California Democratic primary was held on March 3, 2020.
Polling aggregation :
| Source of poll aggregation | Date updated | Dates polled | Bernie Sanders | Joe Biden | Elizabeth Warren | Michael Bloomberg | Tulsi Gabbard | Other/ Undecided |
| 270 to Win | March 3, 2020 | February 20 – March 1, 2020 | 33.0% | 20.0% | 14.4% | 15.0% | 1.2% | 16.4% |
| RealClear Politics | March 3, 2020 | February 28 – March 2, 2020 | 35.0% | 23.0% | 16.0% | 14.0% | 1.5% | 10.5% |
| FiveThirtyEight | March 3, 2020 | until March 2, 2020 | 31.2% | 21.7% | 14.9% | 14.7% | 0.7% | 16.8% |
| Average | Average | Average | 33.1% | 21.6% | 15.1% | 14.6% | 1.1% | 14.5% |
| California primary results (March 3, 2020) | California primary results (March 3, 2020) | California primary results (March 3, 2020) | 36.0% | 27.9% | 13.2% | 12.1% | 0.6% | 10.2% |
Polling from January 1 to March 3, 2020 :
| Poll source | Date(s) administered | Sample size | Margin of error | Joe Biden | Michael Bloomberg | Pete Buttigieg | Amy Klobuchar | Bernie Sanders | Tom Steyer | Elizabeth Warren | Andrew Yang | Other | Undecided |
| | March 2, 2020 | Klobuchar withdraws from the race. | Klobuchar withdraws from the race. | Klobuchar withdraws from the race. | Klobuchar withdraws from the race. | Klobuchar withdraws from the race. | Klobuchar withdraws from the race. | Klobuchar withdraws from the race. | Klobuchar withdraws from the race. | Klobuchar withdraws from the race. | Klobuchar withdraws from the race. | Klobuchar withdraws from the race. | Klobuchar withdraws from the race. |
| Swayable | March 1–2, 2020 | 3,388 (LV) | ± 2.0% | 20.8% | 19.3% | 8.4% | 3.3% | 28.7% | 4.0% | 9.6% | – | 6.0% | – |
| Data for Progress | February 28 – March 2, 2020 | 516 (LV) | ± 4.3% | 25% | 17% | 5% | 3% | 32% | – | 16% | – | 1% | – |
| AtlasIntel | February 24 – March 2, 2020 | 727 (LV) | ± 4.0% | 26% | 15% | 3% | 1% | 34% | – | 15% | – | 2% | 4% |
| | March 1, 2020 | Buttigieg withdraws from the race. | Buttigieg withdraws from the race. | Buttigieg withdraws from the race. | Buttigieg withdraws from the race. | Buttigieg withdraws from the race. | Buttigieg withdraws from the race. | Buttigieg withdraws from the race. | Buttigieg withdraws from the race. | Buttigieg withdraws from the race. | Buttigieg withdraws from the race. | Buttigieg withdraws from the race. | Buttigieg withdraws from the race. |
| Point Blank Political | February 29 – March 1, 2020 | 1,220 (LV) | ± 4.1% | 22% | 10% | 6% | 3% | 34% | 1% | 14% | – | 1% | 9% |
| Emerson College/Nexstar | February 29 – March 1, 2020 | 545 (LV) | ± 4.1% | 21% | 11% | 7% | 5% | 38% | 2% | 16% | – | 1% | – |
| | February 29, 2020 | South Carolina primary; Steyer withdraws from the race after close of polls. | South Carolina primary; Steyer withdraws from the race after close of polls. | South Carolina primary; Steyer withdraws from the race after close of polls. | South Carolina primary; Steyer withdraws from the race after close of polls. | South Carolina primary; Steyer withdraws from the race after close of polls. | South Carolina primary; Steyer withdraws from the race after close of polls. | South Carolina primary; Steyer withdraws from the race after close of polls. | South Carolina primary; Steyer withdraws from the race after close of polls. | South Carolina primary; Steyer withdraws from the race after close of polls. | South Carolina primary; Steyer withdraws from the race after close of polls. | South Carolina primary; Steyer withdraws from the race after close of polls. | South Carolina primary; Steyer withdraws from the race after close of polls. |
| YouGov/CBS News | February 27–29, 2020 | 1,411 (LV) | ± 4.0% | 19% | 12% | 9% | 4% | 31% | 3% | 18% | – | 4% | – |
| Suffolk University | February 26–29, 2020 | 500 (LV) | ± 4.4% | 14% | 16% | 7% | 5% | 35% | 3% | 12% | – | 3% | – |
| YouGov/Hoover Institution/Stanford University | February 26–28, 2020 | 1,020 (LV) | – | 19% | 13% | 9% | 6% | 28% | 4% | 18% | – | 3% | – |
| Point Blank Political | February 26–28, 2020 | 2,276 (LV) | ± 2.9% | 14% | 12% | 9% | 3% | 34% | 3% | 14% | – | 1% | 10% |
| Point Blank Political | February 26–28, 2020 | 2,276 (LV) | ± 2.9% | 40% | – | – | – | 50% | – | – | – | – | 11% |
| Point Blank Political | February 26–28, 2020 | 2,276 (LV) | ± 2.9% | – | 32% | – | – | 57% | – | – | – | – | 11% |
| Point Blank Political | February 26–28, 2020 | 2,276 (LV) | ± 2.9% | – | – | – | – | 46% | – | 36% | – | – | 16% |
| CNN/SSRS | February 22–26, 2020 | 488 (LV) | ± 5.2% | 13% | 12% | 7% | 6% | 35% | 3% | 14% | – | 3% | 8% |
| | February 25, 2020 | Tenth Democratic primary debate | Tenth Democratic primary debate | Tenth Democratic primary debate | Tenth Democratic primary debate | Tenth Democratic primary debate | Tenth Democratic primary debate | Tenth Democratic primary debate | Tenth Democratic primary debate | Tenth Democratic primary debate | Tenth Democratic primary debate | Tenth Democratic primary debate | Tenth Democratic primary debate |
| Point Blank Political | February 23–25, 2020 | 2,098 (LV) | ± 3.0% | 11% | 11% | 9% | 4% | 34% | 3% | 13% | – | 2% | 13% |
| Berkeley IGS/LA Times | Feb 20–25, 2020 | 3,002 (LV) | ± 2.0% | 8% | 12% | 11% | 6% | 34% | 2% | 17% | 1% | 2% | 7% |
| | February 22, 2020 | Nevada caucuses | Nevada caucuses | Nevada caucuses | Nevada caucuses | Nevada caucuses | Nevada caucuses | Nevada caucuses | Nevada caucuses | Nevada caucuses | Nevada caucuses | Nevada caucuses | Nevada caucuses |
| Change Research/KQED News | February 20–23, 2020 | 1,069 (LV) | ± 3.4% | 12% | 6% | 11% | 5% | 37% | 3% | 20% | 4% | 3% | – |
| University of Massachusetts Lowell | February 12–20, 2020 | 450 (LV) | ± 6.7% | 13% | 12% | 12% | 7% | 24% | 2% | 16% | – | 7% | 6% |
| Monmouth University | February 16–19, 2020 | 408 (LV) | ± 4.9% | 17% | 13% | 9% | 4% | 24% | 5% | 10% | – | 3% | 13% |
| Monmouth University | February 16–19, 2020 | 408 (LV) | ± 4.9% | 36% | – | – | – | 44% | – | – | – | 15% | 5% |
| Monmouth University | February 16–19, 2020 | 408 (LV) | ± 4.9% | – | 31% | – | – | 48% | – | – | – | 14% | 6% |
| Monmouth University | February 16–19, 2020 | 408 (LV) | ± 4.9% | – | – | 26% | – | 51% | – | – | – | 16% | 7% |
| Monmouth University | February 16–19, 2020 | 408 (LV) | ± 4.9% | – | – | – | 24% | 54% | – | – | – | 16% | 6% |
| Public Policy Institute of California | February 7–17, 2020 | 573 (LV) | ± 5.7% | 14% | 12% | 12% | 5% | 32% | 3% | 13% | – | 2% | 8% |
| SurveyUSA | February 13–16, 2020 | 520 (LV) | ± 4.8% | 15% | 21% | 12% | 6% | 25% | 3% | 9% | – | 1% | 9% |
| YouGov/USC | February 1–15, 2020 | – | – | 21% | 8% | 6% | 3% | 29% | 2% | 20% | – | 2% | 9% |
| | February 11, 2020 | New Hampshire primary; Yang withdraws from the race after close of polls. | New Hampshire primary; Yang withdraws from the race after close of polls. | New Hampshire primary; Yang withdraws from the race after close of polls. | New Hampshire primary; Yang withdraws from the race after close of polls. | New Hampshire primary; Yang withdraws from the race after close of polls. | New Hampshire primary; Yang withdraws from the race after close of polls. | New Hampshire primary; Yang withdraws from the race after close of polls. | New Hampshire primary; Yang withdraws from the race after close of polls. | New Hampshire primary; Yang withdraws from the race after close of polls. | New Hampshire primary; Yang withdraws from the race after close of polls. | New Hampshire primary; Yang withdraws from the race after close of polls. | New Hampshire primary; Yang withdraws from the race after close of polls. |
| Capitol Weekly | February 6–9, 2020 | 843 (LV) | – | 8% | 8% | 15% | 7% | 25% | 4% | 19% | 5% | 6% | 3% |
| Capitol Weekly | February 6–9, 2020 | 843 (LV) | – | 11% | 13% | 14% | 5% | 29% | 3% | 16% | 4% | 5% | 1% |
| | February 3, 2020 | Iowa Caucuses | Iowa Caucuses | Iowa Caucuses | Iowa Caucuses | Iowa Caucuses | Iowa Caucuses | Iowa Caucuses | Iowa Caucuses | Iowa Caucuses | Iowa Caucuses | Iowa Caucuses | Iowa Caucuses |
| Change Research/KQED News | January 25–27, 2020 | 1,967 (LV) | – | 15% | 4% | 8% | 3% | 30% | 2% | 16% | 5% | 4% | 13% |
| Berkeley IGS/LA Times | January 15–21, 2020 | 2,895 (LV) | ± 2.5% | 15.0% | 6.0% | 7.2% | 4.9% | 26.3% | 1.8% | 19.6% | 3.9% | 3.6% | 11.7% |
| SurveyUSA | January 14–16, 2020 | 565 (LV) | ± 5.1% | 30% | 6% | 8% | 2% | 20% | 4% | 20% | 4% | 2% | 4% |
| | January 13, 2020 | Booker withdraws from the race. | Booker withdraws from the race. | Booker withdraws from the race. | Booker withdraws from the race. | Booker withdraws from the race. | Booker withdraws from the race. | Booker withdraws from the race. | Booker withdraws from the race. | Booker withdraws from the race. | Booker withdraws from the race. | Booker withdraws from the race. | Booker withdraws from the race. |
| Public Policy Institute of California/Mercury News | January 3–12, 2020 | 530 (LV) | ± 6.5% | 24% | 1% | 6% | 4% | 27% | – | 23% | 3% | 5% | 7% |
| Tulchin Research/USC Rossier/The Hill | January 3–10, 2020 | 1,121 (LV) | – | 25% | 7% | 8% | 2% | 29% | 3% | 12% | 5% | 2% | 6% |
| Capitol Weekly | January 1–9, 2020 | 1,053 (LV) | – | 20% | 6% | 11% | 5% | 24% | 2% | 21% | 7% | 3% | – |
Polling before 1 January 2020 :
| Poll source | Date(s) administered | Sample size | Margin of error | Joe Biden | Cory Booker | Pete Buttigieg | Kamala Harris | Beto O'Rourke | Bernie Sanders | Elizabeth Warren | Andrew Yang | Other | Undecided |
| Change Research/KQED News | December 6–10, 2019 | 862 (LV) | ± 3.3% | 19% | 3% | 12% | – | – | 26% | 23% | 4% | 13% | – |
| CNN/SSRS | December 4–8, 2019 | 508 (LV) | ± 5.2% | 21% | 3% | 9% | – | – | 20% | 17% | 6% | 12% | 11% |
| Capitol Weekly | December 3–7, 2019 | 581 (LV) | – | 19% | 2% | 14% | – | – | 19% | 23% | 5% | 17% | 1% |
| Capitol Weekly | December 3–7, 2019 | 581 (LV) | – | 19% | 2% | 13% | 4% | – | 19% | 21% | 5% | 17% | 0% |
| | December 3, 2019 | Harris withdraws from the race. | Harris withdraws from the race. | Harris withdraws from the race. | Harris withdraws from the race. | Harris withdraws from the race. | Harris withdraws from the race. | Harris withdraws from the race. | Harris withdraws from the race. | Harris withdraws from the race. | Harris withdraws from the race. | Harris withdraws from the race. | Harris withdraws from the race. |
| Berkeley IGS/LA Times | November 21–27, 2019 | 1,252 (LV) | – | 14% | 1% | 12% | 7% | – | 24% | 22% | 3% | 12% | 9% |
| SurveyUSA | November 20–22, 2019 | 558 (LV) | ± 4.8% | 28% | 3% | 8% | 10% | – | 18% | 13% | 5% | 11% | 5% |
| Capitol Weekly | November 1–12, 2019 | 695 (LV) | – | 18% | 1% | 14% | 6% | – | 21% | 27% | 4% | 8% | 1% |
| Public Policy Institute of California | November 3–12, 2019 | 682 (LV) | – | 24% | 1% | 7% | 8% | – | 17% | 23% | 5% | 6% | 9% |
| | November 1, 2019 | O'Rourke withdraws from the race. | O'Rourke withdraws from the race. | O'Rourke withdraws from the race. | O'Rourke withdraws from the race. | O'Rourke withdraws from the race. | O'Rourke withdraws from the race. | O'Rourke withdraws from the race. | O'Rourke withdraws from the race. | O'Rourke withdraws from the race. | O'Rourke withdraws from the race. | O'Rourke withdraws from the race. | O'Rourke withdraws from the race. |
| Change Research | October 15–18, 2019 | 1,631 (LV) | – | 19% | 1% | 9% | 8% | 1% | 24% | 28% | 3% | 6% | – |
| SurveyUSA | October 15–16, 2019 | 553 (LV) | ± 6.9% | 33% | 2% | 4% | 8% | 2% | 17% | 18% | 4% | 5% | 8% |
| Capitol Weekly | October 1–14, 2019 | 590 (LV) | – | 21% | 2% | 6% | 8% | 0% | 15% | 35% | 3% | 9% | – |
| [[Public Policy Institute of<br ]]/[[>California]] | September 16–25, 2019 | 692 (LV) | ± 4.9% | 22% | 2% | 6% | 8% | 1% | 21% | 23% | 3% | 7% | 9% |
| Berkeley IGS/LA Times | September 13–18, 2019 | 2,272 | – | 20% | 1% | 6% | 8% | 3% | 19% | 29% | 2% | 5% | 8% |
| Emerson College | September 13–16, 2019 | 424 | ± 4.7% | 26% | 1% | 4% | 6% | 5% | 26% | 20% | 7% | 4% | – |
| SurveyUSA | September 13–15, 2019 | 547 | ± 4.8% | 27% | 2% | 3% | 13% | 2% | 18% | 16% | 7% | 4% | 7% |
| Change Research/KQED | September 12–15, 2019 | 3,325 | ± 1.7% | 18% | 2% | 10% | 11% | 2% | 23% | 25% | 3% | 5% | – |
| Capitol Weekly | September 1–13, 2019 | 599 | – | 18% | 1% | 7% | 11% | 2% | 21% | 29% | 4% | 5% | – |
| Capitol Weekly | September 1–13, 2019 | 5,510 | – | 18% | 1% | 8% | 11% | 2% | 17% | 33% | 3% | 7% | – |
| SurveyUSA | August 1–5, 2019 | 528 | ± 6.3% | 25% | 1% | 6% | 17% | 0% | 18% | 21% | 1% | 1% | 10% |
| PPIC | July 14–23, 2019 | 766 | ± 4.4% | 11% | – | 5% | 19% | – | 12% | 15% | – | 14% | 25% |
| YouGov/CBS News | July 9–18, 2019 | 1,514 | ± 2.9% | 24% | 1% | 6% | 23% | 1% | 16% | 19% | 1% | 9% | – |
| Quinnipiac University | July 10–15, 2019 | 519 | ± 5.7% | 21% | 1% | 3% | 23% | 1% | 18% | 16% | 2% | 2% | 10% |
| Capitol Weekly | July 1–15, 2019 | 816 | – | 20% | 1% | 8% | 20% | 2% | 16% | 25% | 1% | 7% | – |
| Change Research | July 9–11, 2019 | 1,609 | ± 2.5% | 17% | 1% | 8% | 23% | 2% | 20% | 22% | 2% | 5% | – |
| | July 8, 2019 | Swalwell withdraws from the race. | Swalwell withdraws from the race. | Swalwell withdraws from the race. | Swalwell withdraws from the race. | Swalwell withdraws from the race. | Swalwell withdraws from the race. | Swalwell withdraws from the race. | Swalwell withdraws from the race. | Swalwell withdraws from the race. | Swalwell withdraws from the race. | Swalwell withdraws from the race. | Swalwell withdraws from the race. |
| Capitol Weekly | June 1–30, 2019 | 813 | – | 23% | 2% | 8% | 14% | 2% | 19% | 23% | 2% | 9% | – |
| UC Berkeley | June 4–10, 2019 | 2,131 | ± 3.0% | 22% | 1% | 10% | 13% | 3% | 17% | 18% | 1% | 3% | 11% |
| Capitol Weekly | May 1–31, 2019 | 1,180 | – | 29% | 2% | 9% | 17% | 4% | 22% | 11% | 0% | 6% | – |
| Change Research | May 25–28, 2019 | 1,649 | ± 2.4% | 30% | 1% | 12% | 15% | 3% | 23% | 12% | 1% | 2% | – |
| Capitol Weekly | April 15–30, 2019 | 1,204 | – | 20% | 2% | 19% | 17% | 4% | 20% | 10% | – | 9% | – |
| | April 25, 2019 | Biden announces his candidacy. | Biden announces his candidacy. | Biden announces his candidacy. | Biden announces his candidacy. | Biden announces his candidacy. | Biden announces his candidacy. | Biden announces his candidacy. | Biden announces his candidacy. | Biden announces his candidacy. | Biden announces his candidacy. | Biden announces his candidacy. | Biden announces his candidacy. |
| | April 14, 2019 | Buttigieg announces his candidacy. | Buttigieg announces his candidacy. | Buttigieg announces his candidacy. | Buttigieg announces his candidacy. | Buttigieg announces his candidacy. | Buttigieg announces his candidacy. | Buttigieg announces his candidacy. | Buttigieg announces his candidacy. | Buttigieg announces his candidacy. | Buttigieg announces his candidacy. | Buttigieg announces his candidacy. | Buttigieg announces his candidacy. |
| Change Research | April 6–9, 2019 | 2,003 | ± 2.2% | 21% | 3% | 9% | 19% | 10% | 22% | 8% | 1% | 7% | – |
| Change Research | April 6–9, 2019 | 2,003 | ± 2.2% | – | 5% | 11% | 27% | 16% | 28% | 9% | 1% | 5% | – |
| | April 8, 2019 | Swalwell announces his candidacy. | Swalwell announces his candidacy. | Swalwell announces his candidacy. | Swalwell announces his candidacy. | Swalwell announces his candidacy. | Swalwell announces his candidacy. | Swalwell announces his candidacy. | Swalwell announces his candidacy. | Swalwell announces his candidacy. | Swalwell announces his candidacy. | Swalwell announces his candidacy. | Swalwell announces his candidacy. |
| Quinnipiac University | April 3–8, 2019 | 482 | ± 5.9% | 26% | 2% | 7% | 17% | 4% | 18% | 7% | 1% | 6% | 13% |
| | March 14, 2019 | O'Rourke announces his candidacy. | O'Rourke announces his candidacy. | O'Rourke announces his candidacy. | O'Rourke announces his candidacy. | O'Rourke announces his candidacy. | O'Rourke announces his candidacy. | O'Rourke announces his candidacy. | O'Rourke announces his candidacy. | O'Rourke announces his candidacy. | O'Rourke announces his candidacy. | O'Rourke announces his candidacy. | O'Rourke announces his candidacy. |
| | February 19, 2019 | Sanders announces his candidacy. | Sanders announces his candidacy. | Sanders announces his candidacy. | Sanders announces his candidacy. | Sanders announces his candidacy. | Sanders announces his candidacy. | Sanders announces his candidacy. | Sanders announces his candidacy. | Sanders announces his candidacy. | Sanders announces his candidacy. | Sanders announces his candidacy. | Sanders announces his candidacy. |
| Change Research | February 9–11, 2019 | 948 | – | 26% | 3% | 1% | 26% | 8% | 20% | 7% | 0% | 7% | – |
| Change Research | February 9–11, 2019 | 948 | – | – | 7% | 2% | 53% | – | – | 23% | 1% | 15% | – |

## Colorado primary

The Colorado Democratic primary was held on March 3, 2020.
Polling Aggregation :
| Source of poll aggregation | Date updated | Dates polled | Bernie Sanders | Joe Biden | Elizabeth Warren | Michael Bloomberg | Tulsi Gabbard | Un- decided |
| 270 to Win | March 3, 2020 | Feb 24–Mar 2, 2020 | 29.3% | 16.3% | 16.0% | 15.3% | 1.0% | 22.1% |
| RealClear Politics | March 3, 2020 | Insufficient recent polling to supply an average. | Insufficient recent polling to supply an average. | Insufficient recent polling to supply an average. | Insufficient recent polling to supply an average. | Insufficient recent polling to supply an average. | Insufficient recent polling to supply an average. | Insufficient recent polling to supply an average. |
| FiveThirtyEight | March 3, 2020 | until March 3, 2020 | 26.8% | 18.2% | 16.3% | 15.8% | 0.5% | 22.4% |
| Average | Average | Average | 28.0% | 17.3% | 16.2% | 15.6% | 0.8% | 22.1% |
| Colorado primary results (March 3, 2020) | Colorado primary results (March 3, 2020) | Colorado primary results (March 3, 2020) | 37.0% | 24.6% | 17.6% | 18.5% | 1.0% | 1.3% |
Tabulation of individual polls of the 2020 Colorado Democratic Primary :
| Poll source | Date(s) administered | Sample size | Margin of error | Michael Bennet | Joe Biden | Michael Bloomberg | Pete Buttigieg | Kamala Harris | John Hickenlooper | Bernie Sanders | Elizabeth Warren | Andrew Yang | Other | Undecided |
| | Mar 2, 2020 | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race |
| Swayable | Mar 1–2, 2020 | 921 (LV) | ± 4.0% | – | 20% | 19% | 12% | – | – | 29% | 12% | – | 7% | – |
| Data for Progress | Feb 28–Mar 2, 2020 | 464 (LV) | ± 4.2% | – | 18% | 16% | 8% | – | – | 32% | 21% | – | 5% | – |
| | Mar 1, 2020 | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race |
| Elucd | Feb 26–Mar 1, 2020 | 561 (LV) | ± 4.1% | – | 10% | 9% | 10% | – | – | 34% | 14% | – | 9% | 14% |
| Magellan Strategies | Feb 24–25, 2020 | 500 (LV) | ± 4.38% | – | 11% | 11% | 12% | – | – | 27% | 15% | – | 9% | 15% |
| Data for Progress | Feb 23–25, 2020 | 471 (LV) | ± 4.7% | – | 10% | 14% | 14% | – | – | 34% | 20% | – | 7% | 1% |
| | Feb 11, 2020 | New Hampshire primary; Yang and Bennet withdraw from the race | New Hampshire primary; Yang and Bennet withdraw from the race | New Hampshire primary; Yang and Bennet withdraw from the race | New Hampshire primary; Yang and Bennet withdraw from the race | New Hampshire primary; Yang and Bennet withdraw from the race | New Hampshire primary; Yang and Bennet withdraw from the race | New Hampshire primary; Yang and Bennet withdraw from the race | New Hampshire primary; Yang and Bennet withdraw from the race | New Hampshire primary; Yang and Bennet withdraw from the race | New Hampshire primary; Yang and Bennet withdraw from the race | New Hampshire primary; Yang and Bennet withdraw from the race | New Hampshire primary; Yang and Bennet withdraw from the race | New Hampshire primary; Yang and Bennet withdraw from the race | New Hampshire primary; Yang and Bennet withdraw from the race |
| | Dec 3, 2019 | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race |
| Emerson College | Aug 16–19, 2019 | 403 (LV) | ± 4.8% | 1% | 25% | – | 5% | 13% | – | 26% | 20% | 4% | 8% | – |
| | Aug 15, 2019 | Hickenlooper withdraws from the race | Hickenlooper withdraws from the race | Hickenlooper withdraws from the race | Hickenlooper withdraws from the race | Hickenlooper withdraws from the race | Hickenlooper withdraws from the race | Hickenlooper withdraws from the race | Hickenlooper withdraws from the race | Hickenlooper withdraws from the race | Hickenlooper withdraws from the race | Hickenlooper withdraws from the race | Hickenlooper withdraws from the race | Hickenlooper withdraws from the race | Hickenlooper withdraws from the race |
| Public Policy Polling | Jul 12–14, 2019 | 519 (LV) | – | 5% | 22% | – | 7% | 9% | 7% | 15% | 19% | 0% | 14% | – |

## Maine primary

The Maine Democratic primary was held on March 3, 2020.
Polling Aggregation :
| Source of poll aggregation | Date updated | Dates polled | Bernie Sanders | Joe Biden | Michael Bloomberg | Elizabeth Warren | Tulsi Gabbard | Undecided |
| 270 to Win | Mar 3, 2020 | Feb 10–Mar 2, 2020 | 28.7% | 19.7% | 20.0% | 13.3% | 1.3% | 17.0% |
| RealClear Politics | Mar 3, 2020 | Feb 28–Mar 2, 2020 | 38.5% | 24.5% | 14.0% | 18.0% | – | 5.0% |
| FiveThirtyEight | Mar 3, 2020 | until Mar 2, 2020 | 31.1% | 21.7% | 17.2% | 14.2% | 0.7% | 19.6% |
| Average | Average | Average | 32.8% | 22.0% | 17.1% | 15.2% | 1.0% | 11.9% |
| Maine primary results (March 3, 2020) | Maine primary results (March 3, 2020) | Maine primary results (March 3, 2020) | 32.4% | 33.4% | 11.8% | 15.6% | 0.9% | 5.9% |
Tabulation of individual polls of the 2020 Maine Democratic Primary :
| Poll source | Date(s) administered | Sample size | Margin of error | Joe Biden | Michael Bloomberg | Pete Buttigieg | Kamala Harris | Bernie Sanders | Elizabeth Warren | Andrew Yang | Other | Undecided |
| | Mar 2, 2020 | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race |
| Swayable | Mar 1–2, 2020 | 209 (LV) | ± 9.0% | 22% | 28% | 10% | – | 27% | 11% | – | 3% | – |
| Change Research | Mar 1–2, 2020 | 507 (LV) | – | 24% | 10% | – | – | 43% | 16% | – | 7% | – |
| Data for Progress | Feb 28–Mar 2, 2020 | 385 (LV) | ± 4.9% | 25% | 18% | 1% | – | 34% | 20% | – | 2% | – |
| | Mar 1, 2020 | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race |
| SocialSphere/Colby College | Feb 10–13, 2020 | 350 (LV) | – | 12% | 14% | 16% | – | 25% | 9% | 2% | 10% | 12% |
| | Feb 11, 2020 | Yang withdraws from the race | Yang withdraws from the race | Yang withdraws from the race | Yang withdraws from the race | Yang withdraws from the race | Yang withdraws from the race | Yang withdraws from the race | Yang withdraws from the race | Yang withdraws from the race | Yang withdraws from the race | Yang withdraws from the race |
| | Dec 3, 2019 | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race |
| Maine People's Resource Center | Oct 14–21, 2019 | 728 (LV) | ± 3.63% | 26.8% | – | 9.1% | 5.0% | 15.4% | 22.1% | 1.7% | 11.4% | 4.4% |
| Public Policy Polling | Oct 11–13, 2019 | 366 (LV) | ± 5.1% | 19% | – | 9% | 4% | 12% | 31% | 3% | 20% | – |
| Gravis Marketing | Jun 24, 2019 | 243 | ± 6.3% | 25% | – | 8% | 2% | 15% | 17% | 5% | 15% | 11% |

## Massachusetts primary

The Massachusetts Democratic primary was held on March 3, 2020.
Polling Aggregation :
| Source of poll aggregation | Date updated | Dates polled | Bernie Sanders | Elizabeth Warren | Joe Biden | Michael Bloomberg | Tulsi Gabbard | Others/ Undecided |
| 270 to Win | March 3, 2020 | Until March 3, 2020 | 22.4% | 21.0% | 15.0% | 13.6% | 1.8% | 26.2% |
| FiveThirtyEight | March 3, 2020 | until March 3, 2020 | 24.4% | 21.0% | 18.1% | 14.5% | 0.4% | 21.6% |
| Average | Average | Average | 23.4% | 21.0% | 16.6% | 14.0% | 1.1% | 23.9% |
| Massachusetts primary results (March 3, 2020) | Massachusetts primary results (March 3, 2020) | Massachusetts primary results (March 3, 2020) | 26.6% | 21.4% | 33.4% | 11.7% | 0.7% | 6.1% |
Tabulation of individual polls of the 2020 Massachusetts Democratic Primary :
| Poll source | Date(s) administered | Sample size | Margin of error | Joe Biden | Michael Bloomberg | Cory Booker | Pete Buttigieg | Kamala Harris | Amy Klobuchar | Beto O'Rourke | Deval Patrick | Bernie Sanders | Elizabeth Warren | Other | Undecided |
| | Mar 2, 2020 | Klobuchar withdraws from the race; endorses Biden | Klobuchar withdraws from the race; endorses Biden | Klobuchar withdraws from the race; endorses Biden | Klobuchar withdraws from the race; endorses Biden | Klobuchar withdraws from the race; endorses Biden | Klobuchar withdraws from the race; endorses Biden | Klobuchar withdraws from the race; endorses Biden | Klobuchar withdraws from the race; endorses Biden | Klobuchar withdraws from the race; endorses Biden | Klobuchar withdraws from the race; endorses Biden | Klobuchar withdraws from the race; endorses Biden | Klobuchar withdraws from the race; endorses Biden | Klobuchar withdraws from the race; endorses Biden | Klobuchar withdraws from the race; endorses Biden |
| Swayable | Mar 1–2, 2020 | 917 (LV) | ± 4.0% | 17% | 18% | – | 11% | – | 5% | – | – | 27% | 15% | 8% | – |
| Data for Progress | Feb 28–Mar 2, 2020 | 301 (LV) | ± 5.6% | 26% | 15% | – | 2% | – | 1% | – | – | 26% | 28% | 2% | – |
| | Mar 1, 2020 | Buttigieg withdraws from the race; endorses Biden | Buttigieg withdraws from the race; endorses Biden | Buttigieg withdraws from the race; endorses Biden | Buttigieg withdraws from the race; endorses Biden | Buttigieg withdraws from the race; endorses Biden | Buttigieg withdraws from the race; endorses Biden | Buttigieg withdraws from the race; endorses Biden | Buttigieg withdraws from the race; endorses Biden | Buttigieg withdraws from the race; endorses Biden | Buttigieg withdraws from the race; endorses Biden | Buttigieg withdraws from the race; endorses Biden | Buttigieg withdraws from the race; endorses Biden | Buttigieg withdraws from the race; endorses Biden | Buttigieg withdraws from the race; endorses Biden |
| Suffolk University/Boston Globe/WBZ-TV | Feb 26–29, 2020 | 500 (LV) | - | 11.0% | 13.0% | – | 12.4% | – | 5.0% | – | – | 24.2% | 22.2% | 3.6% | 8.6% |
| WBUR/MassINC | Feb 23–26, 2020 | 426 (LV) | ± 4.9% | 9% | 13% | - | 14% | - | 6% | - | - | 25% | 17% | 9% | 8% |
| UMass Amherst | Feb 18–24, 2020 | 400 (LV) | ± 5.9% | 12% | 9% | - | 14% | - | 7% | - | - | 25% | 23% | 8% | 3% |
| Falchuk & DiNatale | Feb 16–18, 2020 | 453 (LV) | – | 13% | 13% | – | 13% | – | 14% | – | – | 17% | 16% | 5% | 8% |
| University of Massachusetts Lowell | Feb 12–19, 2020 | 450 (LV) | ± 6.1% | 14% | 12% | – | 15% | – | 9% | – | – | 21% | 20% | 6% | 4% |
| | Feb 12, 2020 | Patrick withdraws from the race | Patrick withdraws from the race | Patrick withdraws from the race | Patrick withdraws from the race | Patrick withdraws from the race | Patrick withdraws from the race | Patrick withdraws from the race | Patrick withdraws from the race | Patrick withdraws from the race | Patrick withdraws from the race | Patrick withdraws from the race | Patrick withdraws from the race | Patrick withdraws from the race | Patrick withdraws from the race |
| Falchuk & DiNatale | Jan 27–30, 2020 | 334 (LV) | – | 16% | 8% | – | 6% | – | 7% | – | 3% | 12% | 23% | 7% | – |
| | Jan 13, 2020 | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race |
| | Dec 3, 2019 | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race |
| | Nov 24, 2019 | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy |
| | Nov 14, 2019 | Patrick announces his candidacy | Patrick announces his candidacy | Patrick announces his candidacy | Patrick announces his candidacy | Patrick announces his candidacy | Patrick announces his candidacy | Patrick announces his candidacy | Patrick announces his candidacy | Patrick announces his candidacy | Patrick announces his candidacy | Patrick announces his candidacy | Patrick announces his candidacy | Patrick announces his candidacy | Patrick announces his candidacy |
| | Nov 1, 2019 | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race |
| WBUR | Oct 16–20, 2019 | 456 | ± 4.6% | 18% | – | 0% | 7% | 3% | 1% | 0% | – | 13% | 33% | 7% | 15% |
| Suffolk University | Sep 3–5, 2019 | 500 | - | 26% | – | 1% | 5% | 3% | 0% | 1% | – | 8% | 24% | 6% | 25% |
| | Aug 23, 2019 | Moulton withdraws from the race | Moulton withdraws from the race | Moulton withdraws from the race | Moulton withdraws from the race | Moulton withdraws from the race | Moulton withdraws from the race | Moulton withdraws from the race | Moulton withdraws from the race | Moulton withdraws from the race | Moulton withdraws from the race | Moulton withdraws from the race | Moulton withdraws from the race | Moulton withdraws from the race | Moulton withdraws from the race |
| Suffolk University | Jun 5–9, 2019 | 370 | ± 5.1% | 22% | – | 1% | 8% | 5% | 0% | 1% | – | 6% | 10% | 5% | 42% |
| | Apr 25, 2019 | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy |
| | Apr 22, 2019 | Moulton announces his candidacy | Moulton announces his candidacy | Moulton announces his candidacy | Moulton announces his candidacy | Moulton announces his candidacy | Moulton announces his candidacy | Moulton announces his candidacy | Moulton announces his candidacy | Moulton announces his candidacy | Moulton announces his candidacy | Moulton announces his candidacy | Moulton announces his candidacy | Moulton announces his candidacy | Moulton announces his candidacy |
| | Apr 14, 2019 | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy |
| Emerson College | Apr 4–7, 2019 | 371 | ± 5.0% | 23% | – | 2% | 11% | 7% | 2% | 8% | – | 26% | 14% | 8% | – |
| | Mar 14, 2019 | O'Rourke announces his candidacy | O'Rourke announces his candidacy | O'Rourke announces his candidacy | O'Rourke announces his candidacy | O'Rourke announces his candidacy | O'Rourke announces his candidacy | O'Rourke announces his candidacy | O'Rourke announces his candidacy | O'Rourke announces his candidacy | O'Rourke announces his candidacy | O'Rourke announces his candidacy | O'Rourke announces his candidacy | O'Rourke announces his candidacy | O'Rourke announces his candidacy |
| | Feb 19, 2019 | Sanders announces his candidacy | Sanders announces his candidacy | Sanders announces his candidacy | Sanders announces his candidacy | Sanders announces his candidacy | Sanders announces his candidacy | Sanders announces his candidacy | Sanders announces his candidacy | Sanders announces his candidacy | Sanders announces his candidacy | Sanders announces his candidacy | Sanders announces his candidacy | Sanders announces his candidacy | Sanders announces his candidacy |
| | Feb 10, 2019 | Klobuchar announces her candidacy | Klobuchar announces her candidacy | Klobuchar announces her candidacy | Klobuchar announces her candidacy | Klobuchar announces her candidacy | Klobuchar announces her candidacy | Klobuchar announces her candidacy | Klobuchar announces her candidacy | Klobuchar announces her candidacy | Klobuchar announces her candidacy | Klobuchar announces her candidacy | Klobuchar announces her candidacy | Klobuchar announces her candidacy | Klobuchar announces her candidacy |
| | Feb 9, 2019 | Warren announces her candidacy | Warren announces her candidacy | Warren announces her candidacy | Warren announces her candidacy | Warren announces her candidacy | Warren announces her candidacy | Warren announces her candidacy | Warren announces her candidacy | Warren announces her candidacy | Warren announces her candidacy | Warren announces her candidacy | Warren announces her candidacy | Warren announces her candidacy | Warren announces her candidacy |
| | Feb 1, 2019 | Booker announces his candidacy | Booker announces his candidacy | Booker announces his candidacy | Booker announces his candidacy | Booker announces his candidacy | Booker announces his candidacy | Booker announces his candidacy | Booker announces his candidacy | Booker announces his candidacy | Booker announces his candidacy | Booker announces his candidacy | Booker announces his candidacy | Booker announces his candidacy | Booker announces his candidacy |
| | Jan 21, 2019 | Harris announces her candidacy | Harris announces her candidacy | Harris announces her candidacy | Harris announces her candidacy | Harris announces her candidacy | Harris announces her candidacy | Harris announces her candidacy | Harris announces her candidacy | Harris announces her candidacy | Harris announces her candidacy | Harris announces her candidacy | Harris announces her candidacy | Harris announces her candidacy | Harris announces her candidacy |
| YouGov/UMass Amherst | Nov 7–14, 2018 | 655 | – | 19% | – | 3% | – | 6% | 3% | 10% | 6% | 14% | 11% | 1% | 27% |
Hypothetical polling with only Biden, Sanders and Warren :
| Poll source | Date(s) administered | Sample size | Margin of error | Joe Biden | Bernie Sanders | Elizabeth Warren | Undecided |
| Evan Falchuk and Lou DiNatalie/Commonwealth Magazine | Oct 23–25, 2019 | 443 (LV) | – | 35% | 13% | 41% | 11% |

## Minnesota primary

The Minnesota Democratic primary was held on March 3, 2020. Amy Klobuchar led in pre-election polling, but withdrew from the race the night before the election and endorsed Joe Biden (who went on to win Minnesota).
Polling Aggregation :
| Source of poll aggregation | Date updated | Dates polled | Amy Klobuchar | Bernie Sanders | Elizabeth Warren | Joe Biden | Michael Bloomberg | Tulsi Gabbard | Un- decided |
| 270 to Win | Mar 2, 2020 | Feb 20–22, 2020 | 28.0% | 22.0% | 13.5% | 8.5% | 6.0% | 2.5% | 19.5% |
| FiveThirtyEight | Mar 2, 2020 | until Mar 2, 2020 | 24.4% | 26.2% | 14.4% | 10.7% | 5.6% | 1.5% | 17.2% |
| Average | Average | Average | 26.2% | 24.1% | 14.0% | 9.6% | 5.8% | 2.0% | 18.3% |
| Minnesota Primary results (March 3, 2020) | Minnesota Primary results (March 3, 2020) | Minnesota Primary results (March 3, 2020) | 5.6% | 29.9% | 15.4% | 38.6% | 8.3% | 0.3% | 1.8% |
Tabulation of individual polls of the 2020 Minnesota Democratic Primary :
| Poll source | Date(s) administered | Sample size | Margin of error | Joe Biden | Michael Bloomberg | Pete Buttigieg | Kamala Harris | Amy Klobuchar | Beto O'Rourke | Bernie Sanders | Elizabeth Warren | Other | Undecided |
| | Mar 2, 2020 | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race |
| Swayable | Mar 1–2, 2020 | 1,472 (LV) | ± 4.0% | 20% | 14% | 4% | – | 21% | – | 27% | 8% | 6% | – |
| Data for Progress | Feb 28–Mar 2, 2020 | 650 (LV) | ± 3.84% | 27% | 16% | – | – | 2% | – | 32% | 21% | 1% | – |
| | Mar 1, 2020 | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race |
| Mason-Dixon/Star Tribune/ MPR News Minnesota | Feb 17–20, 2020 | 500(LV) | ± 4.5% | 8% | 3% | 3% | – | 29% | – | 23% | 11% | 2% | 21% |
| University of Massachusetts Lowell | Feb 12–19, 2020 | 450(LV) | ± 6.4% | 9% | 9% | 10% | – | 27% | – | 21% | 16% | 4% | 4% |
| | Dec 3, 2019 | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race |
| | Nov 1, 2019 | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race |
| St. Cloud State University | Oct 14-Nov 1, 2019 | 177 (LV) | – | 15% | – | 2% | – | 15% | – | 12% | 15% | – | – |
| Kaiser Family Foundation | Sep 23–Oct 15, 2019 | 249 | – | 14% | – | 7% | 1% | 15% | 1% | 13% | 25% | 5% | 21% |
| Change Research | Jun 8–12, 2019 | 772 | ± 3.7% | 20% | – | 11% | 4% | 16% | 3% | 19% | 21% | 5% | – |

## North Carolina primary

The North Carolina Democratic primary was held on March 3, 2020.
Polling Aggregation :
| Source of poll aggregation | Date Updated | Dates polled | Joe Biden | Bernie Sanders | Michael Bloomberg | Elizabeth Warren | Tulsi Gabbard | Other/ Undecided |
| 270 to Win | March 3, 2020 | February 21–March 2, 2020 | 27.8% | 25.8% | 17.0% | 11.6% | 0.8% | 17.0% |
| RealClear Politics | March 3, 2020 | February 27–March 2, 2020 | 36.7% | 23.3% | 14.3% | 10.7% | 1.0% | 14.0% |
| FiveThirtyEight | March 3, 2020 | until March 2, 2020 | 34.5% | 22.1% | 14.4% | 11.3% | 0.2% | 17.5% |
| Average | Average | Average | 33.0% | 23.7% | 15.2% | 11.2% | 0.7% | 16.2% |
| North Carolina primary results (March 3, 2020) | North Carolina primary results (March 3, 2020) | North Carolina primary results (March 3, 2020) | 43.0% | 24.1% | 13.0% | 10.5% | 0.5% | 8.9% |
Tabulation of individual polls of the 2020 North Carolina Democratic primary :
| Poll source | Date(s) administered | Sample size | Margin of error | Joe Biden | Michael Bloomberg | Cory Booker | Pete Buttigieg | Kamala Harris | Bernie Sanders | Elizabeth Warren | Andrew Yang | Other | Undecided |
| | Mar 2, 2020 | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race |
| Spry Strategies/Civitas | Mar 1–2, 2020 | 543 (LV) | ± 4.2% | 45% | 11% | – | 3% | – | 18% | 7% | – | 6% | 11% |
| Swayable | Mar 1–2, 2020 | 1,209 (LV) | ± 3.0% | 36% | 18% | – | 4% | – | 23% | 10% | – | 10% | – |
| Data for Progress | Feb 28–Mar 2, 2020 | 334 (LV) | ± 5.3% | 36% | 18% | – | 3% | – | 27% | 14% | – | 3% | – |
| | Mar 1, 2020 | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race |
| Elucd | Feb 26–Mar 1, 2020 | 657 (LV) | ± 3.8% | 25% | 15% | – | 6% | – | 26% | 12% | – | 6% | 10% |
| East Carolina University | Feb 27–28, 2020 | 499 (LV) | ± 5.1% | 29% | 14% | – | 4% | – | 25% | 11% | – | 9% | 9% |
| High Point University | Feb 21–28, 2020 | 274 (LV) | – | 14% | 20% | – | 8% | – | 28% | 12% | – | 13% | 7% |
| High Point University | Feb 21–28, 2020 | 472 (RV) | – | 14% | 18% | – | 8% | – | 31% | 11% | – | 11% | 7% |
| Spry Strategies/Civitas | Feb 26–27, 2020 | 581 (LV) | ± 4.1% | 27% | 16% | – | 4% | – | 19% | 11% | – | 10% | 15% |
| Marist College | Feb 23–27, 2020 | 568 (LV) | ± 5.1% | 24% | 15% | – | 7% | – | 26% | 11% | – | 8% | 7% |
| Marist College | Feb 23–27, 2020 | 974 (RV) | ± 3.9% | 22% | 15% | – | 7% | – | 27% | 11% | – | 9% | 8% |
| Data for Progress | Feb 23–27, 2020 | 536 (LV) | ± 4.2% | 25% | 18% | – | 10% | – | 27% | 11% | – | 8% | – |
| Public Policy Polling | Feb 23–24, 2020 | 852 (LV) | ± 3.4% | 23% | 17% | – | 9% | – | 20% | 11% | – | 8% | 11% |
| Meredith College | Feb 16–24, 2020 | 430 (LV) | – | 17.9% | 17.0% | 0.7% | 10.0% | – | 19.5% | 10.9% | – | 7.6% | 16.5% |
| Spry Strategies/Civitas | Feb 21–23, 2020 | 561 (LV) | ± 3.75% | 20% | 20% | – | 3% | – | 20% | 9% | – | 13% | 14% |
| University of Massachusetts Lowell | Feb 12–18, 2020 | 450 (LV) | ± 6.5% | 16% | 19% | – | 10% | – | 23% | 13% | – | 13% | 6% |
| SurveyUSA/WRAL News | Feb 13–16, 2020 | 698 (LV) | ± 5.0% | 20% | 22% | – | 11% | – | 22% | 8% | – | 7% | 11% |
| | Feb 11, 2020 | New Hampshire primary; Yang withdraws from the race after close of polls | New Hampshire primary; Yang withdraws from the race after close of polls | New Hampshire primary; Yang withdraws from the race after close of polls | New Hampshire primary; Yang withdraws from the race after close of polls | New Hampshire primary; Yang withdraws from the race after close of polls | New Hampshire primary; Yang withdraws from the race after close of polls | New Hampshire primary; Yang withdraws from the race after close of polls | New Hampshire primary; Yang withdraws from the race after close of polls | New Hampshire primary; Yang withdraws from the race after close of polls | New Hampshire primary; Yang withdraws from the race after close of polls | New Hampshire primary; Yang withdraws from the race after close of polls | New Hampshire primary; Yang withdraws from the race after close of polls | New Hampshire primary; Yang withdraws from the race after close of polls |
| High Point University | Jan 31–Feb 6, 2020 | 225 (LV) | – | 24% | 16% | 0% | 8% | – | 20% | 11% | 3% | 9% | 8% |
| High Point University | Jan 31–Feb 6, 2020 | 399 (RV) | – | 19% | 13% | 1% | 6% | – | 25% | 12% | 4% | 8% | 12% |
| Public Policy Polling | Feb 4–5, 2020 | 604 (LV) | – | 25% | 14% | – | 9% | – | 16% | 12% | 5% | 7% | 13% |
| | Jan 13, 2020 | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race |
| Public Policy Polling | Jan 10–12, 2020 | 509 (LV) | – | 31% | 8% | 1% | 6% | – | 18% | 15% | 5% | 6% | 11% |
| | Dec 3, 2019 | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race |
| | Nov 24, 2019 | Bloomberg launches his campaign | Bloomberg launches his campaign | Bloomberg launches his campaign | Bloomberg launches his campaign | Bloomberg launches his campaign | Bloomberg launches his campaign | Bloomberg launches his campaign | Bloomberg launches his campaign | Bloomberg launches his campaign | Bloomberg launches his campaign | Bloomberg launches his campaign | Bloomberg launches his campaign | Bloomberg launches his campaign | Bloomberg launches his campaign |
| Fox News | Nov 10–13, 2019 | 669 | ± 3.5% | 37% | – | 2% | 6% | 4% | 14% | 15% | 2% | 8% | 10% |
| HighPoint University | Nov 1–7, 2019 | 347 | ± 6.4% | 33% | – | 2% | 4% | 5% | 18% | 13% | 2% | 6% | 10% |
| HighPoint University | Nov 1–7, 2019 | 1,049 | ± 3.6% | 18% | – | 2% | 4% | 4% | 15% | 7% | 2% | 7% | 23% |
| Siena Research/New York Times | Oct 13–26, 2019 | 324 | – | 29% | – | 1% | 1% | 1% | 13% | 15% | 0% | 3% | 32% |
| High Point University | Sep 13–19, 2019 | 348 (A) | – | 31% | – | 4% | 3% | 6% | 20% | 15% | 4% | 3% | 9% |
| SurveyUSA/Civitas | Aug 1–5, 2019 | 534 | ± 6.1% | 36% | – | 1% | 5% | 8% | 15% | 13% | 1% | 2% | 17% |
| Emerson College | May 31 – Jun 3, 2019 | 397 | ± 4.9% | 39% | – | 1% | 8% | 5% | 22% | 15% | 1% | 7% | – |

## Oklahoma primary

The Oklahoma Democratic primary was held on March 3, 2020.
Polling Aggregation :
| Source of poll aggregation | Date updated | Dates polled | Joe Biden | Bernie Sanders | Michael Bloomberg | Elizabeth Warren | Tulsi Gabbard | Other/ Undecided |
| 270 to Win | March 3, 2020 | February 17–March 2, 2020 | 28.0% | 23.7% | 16.0% | 12.3% | 1.5% | 18.5% |
| RealClear Politics | March 3, 2020 | Insufficient recent polling to supply an average. | Insufficient recent polling to supply an average. | Insufficient recent polling to supply an average. | Insufficient recent polling to supply an average. | Insufficient recent polling to supply an average. | Insufficient recent polling to supply an average. | Insufficient recent polling to supply an average. |
| FiveThirtyEight | March 3, 2020 | until March 2, 2020 | 30.6% | 22.1% | 13.7% | 13.6% | 1.1% | 18.9% |
| Average | Average | Average | 29.3% | 22.9% | 14.85% | 12.95% | 1.3% | 18.7% |
| Oklahoma primary results (March 3, 2020) | Oklahoma primary results (March 3, 2020) | Oklahoma primary results (March 3, 2020) | 38.7% | 25.4% | 13.9% | 13.4% | 1.7% | 6.9% |
Tabulation of individual polls of the 2020 Oklahoma Democratic primary :
| Poll source | Date(s) administered | Sample size | Margin of error | Joe Biden | Michael Bloomberg | Pete Buttigieg | Kamala Harris | Amy Klobuchar | Bernie Sanders | Elizabeth Warren | Other | Undecided |
| | Mar 1–2, 2020 | Buttigieg and Klobuchar withdraw from the race | Buttigieg and Klobuchar withdraw from the race | Buttigieg and Klobuchar withdraw from the race | Buttigieg and Klobuchar withdraw from the race | Buttigieg and Klobuchar withdraw from the race | Buttigieg and Klobuchar withdraw from the race | Buttigieg and Klobuchar withdraw from the race | Buttigieg and Klobuchar withdraw from the race | Buttigieg and Klobuchar withdraw from the race | Buttigieg and Klobuchar withdraw from the race | Buttigieg and Klobuchar withdraw from the race |
| Swayable | Mar 1–2, 2020 | 472 (LV) | ± 6.0% | 38% | 11% | 1% | – | 1% | 26% | 13% | 9% | – |
| Data for Progress | Feb 28–Mar 2, 2020 | 300 (LV) | ± 5.5% | 35% | 19% | – | – | – | 28% | 16% | 2% | – |
| SoonerPoll | Feb 17–21, 2020 | 409 | 4.84% | 21% | 20% | 10% | – | 7% | 13% | 9% | 2% | 19% |
| Cole Hargrave Snodgrass & Associated | Feb 10–13, 2020 | 172 (LV) | – | 12% | 20% | 1% | – | 6% | 14% | 8% | 21% | 9% |
| | Dec 3, 2019 | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race |
| SoonerPoll | Jul 17–27, 2019 | 152 | – | 26% | – | 6% | 8% | 1% | 5% | 12% | 11% | 34% |

## Tennessee primary

The Tennessee Democratic primary was held on March 3, 2020.
Polling Aggregation :
| Source of poll aggregation | Date updated | Dates polled | Joe Biden | Bernie Sanders | Michael Bloomberg | Elizabeth Warren | Tulsi Gabbard | Other/ Undecided |
| 270 to Win | March 3, 2020 | February 28–March 2, 2020 | 31.0% | 27.0% | 18.5% | 12.0% | 0.5% | 11.0% |
| RealClear Politics | March 3, 2020 | Insufficient recent polling to supply an average. | Insufficient recent polling to supply an average. | Insufficient recent polling to supply an average. | Insufficient recent polling to supply an average. | Insufficient recent polling to supply an average. | Insufficient recent polling to supply an average. | Insufficient recent polling to supply an average. |
| FiveThirtyEight | March 3, 2020 | until March 2, 2020 | 29.0% | 24.7% | 15.7% | 12.3% | 0.2% | 18.1% |
| Average | Average | Average | 30.0% | 25.85% | 17.1% | 12.15% | 0.35% | 14.55% |
| Tennessee primary results (March 3, 2020) | Tennessee primary results (March 3, 2020) | Tennessee primary results (March 3, 2020) | 41.7% | 25.0% | 15.5% | 10.4% | 0.4% | 7.0% |
Tabulation of individual polls of the 2020 Tennessee Democratic Primary :
| Poll source | Date(s) administered | Sample size | Margin of error | Joe Biden | Michael Bloomberg | Pete Buttigieg | Kamala Harris | Bernie Sanders | Elizabeth Warren | Other | Undecided |
| | Mar 1–2, 2020 | Buttigieg and Klobuchar withdraw from the race | Buttigieg and Klobuchar withdraw from the race | Buttigieg and Klobuchar withdraw from the race | Buttigieg and Klobuchar withdraw from the race | Buttigieg and Klobuchar withdraw from the race | Buttigieg and Klobuchar withdraw from the race | Buttigieg and Klobuchar withdraw from the race | Buttigieg and Klobuchar withdraw from the race | Buttigieg and Klobuchar withdraw from the race | Buttigieg and Klobuchar withdraw from the race | Buttigieg and Klobuchar withdraw from the race |
| Swayable | Mar 1–2, 2020 | 1,527 (LV) | ± 4.0% | 28% | 17% | 8% | – | 27% | 9% | 11% | – |
| Data for Progress | Feb 28–Mar 2, 2020 | 368 (LV) | ± 5.1% | 34% | 20% | 2% | – | 27% | 15% | 3% | – |
| | Dec 3, 2019 | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race |
| SurveyMonkey | Jul 2–16, 2019 | 128 | ± 11.2% | 33% | – | 6% | 12% | 13% | 18% | 11% | – |

## Texas primary

The Texas Democratic primary was held on March 3, 2020.
Polling Aggregation :
| Source of poll aggregation | Date updated | Dates polled | Bernie Sanders | Joe Biden | Michael Bloomberg | Elizabeth Warren | Tulsi Gabbard | Other/ Undecided |
| 270 to Win | Mar 2, 2020 | Feb 17-Mar 1, 2020 | 30.2% | 25.6% | 16.8% | 13.6% | 1.0% | 12.8% |
| RealClear Politics | Mar 2, 2020 | Feb 27-Mar 1, 2020 | 29.5% | 28.0% | 18.0% | 14.5% | 2.0% | 8.0% |
| FiveThirtyEight | March 3, 2020 | until March 2, 2020 | 28.2% | 25.5% | 16.5% | 13.3% | 0.4% | 16.1% |
| Average | Average | Average | 29.0% | 26.5% | 17.1% | 13.8% | 0.9% | 12.6% |
| Texas primary results (March 3, 2020) | Texas primary results (March 3, 2020) | Texas primary results (March 3, 2020) | 30.0% | 34.5% | 14.4% | 11.4% | 0.4% | 9.3% |
Polling from January 1, 2020, to March 3, 2020 :
| Poll source | Date(s) administered | Sample size | Margin of error | Joe Biden | Michael Bloomberg | Pete Buttigieg | Amy Klobuchar | Bernie Sanders | Elizabeth Warren | Andrew Yang | Other | Undecided |
| | Mar 2, 2020 | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race |
| Swayable | Mar 1–2, 2020 | 1,378 (LV) | ± 3.0% | 27% | 20% | 5% | 3% | 28% | 12% | – | 6% | – |
| Data for Progress | Feb 28–Mar 2, 2020 | 300 (LV) | ± 5.7% | 30% | 20% | 4% | 3% | 28% | 15% | – | 1% | – |
| AtlasIntel | Feb 24-Mar 2, 2020 | 486 (LV) | ± 4.0% | 25% | 16% | 5% | 3% | 35% | 9% | – | 3% | 4% |
| | Mar 1, 2020 | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race |
| Emerson College/Nexstar | Feb 29-Mar 1, 2020 | 450 (LV) | ± 4.6% | 26% | 16% | 5% | 4% | 31% | 14% | – | 5% | – |
| Elucd | Feb 26-Mar 1, 2020 | 833 (LV) | ± 3.4% | 20% | 14% | 7% | 5% | 31% | 13% | – | – | 11% |
| YouGov/CBS News | Feb 27–29, 2020 | 635 (LV) | ± 6.2% | 26% | 13% | 6% | 6% | 30% | 17% | – | 2% | – |
| Marist College | Feb 23–27, 2020 | 556 (LV) | ± 5.3% | 19% | 15% | 8% | 3% | 34% | 10% | – | 2% | 9% |
| Marist College | Feb 23–27, 2020 | 1,050 (RV) | ± 3.7% | 18% | 16% | 8% | 3% | 35% | 8% | – | 3% | 9% |
| Data for Progress | Feb 23–27, 2020 | 513 (LV) | ± 4.3% | 21% | 21% | 9% | 5% | 30% | 13% | – | 2% | – |
| CNN/SSRS | Feb 22–26, 2020 | 387 (LV) | ± 6.0% | 20% | 18% | 8% | 3% | 29% | 15% | – | 0% | 5% |
| Latino Decisions/Univision/ University of Houston | Feb 21–26, 2020 | 527 (LV) | ± 4.3% | 20% | 20% | 6% | 2% | 26% | 11% | – | 7% | 6% |
| University of Texas at Tyler | Feb 17–26, 2020 | 586 (LV) | ± 4.1% | 19% | 21% | 8% | 4% | 29% | 10% | – | 2% | 5% |
| Public Policy Polling/Progress Texas | Feb 24–25, 2020 | 1,045 (LV) | ± 3.0% | 31% | – | 11% | 7% | 25% | 17% | – | 4% | 5% |
| Public Policy Polling/Progress Texas | Feb 24–25, 2020 | 1,045 (LV) | ± 3.0% | 24% | 17% | 10% | 4% | 24% | 14% | – | 2% | 5% |
| | Feb 22, 2020 | Nevada caucuses | Nevada caucuses | Nevada caucuses | Nevada caucuses | Nevada caucuses | Nevada caucuses | Nevada caucuses | Nevada caucuses | Nevada caucuses | Nevada caucuses | Nevada caucuses | Nevada caucuses |
| University of Massachusetts Lowell | Feb 12–18, 2020 | 600 (LV) | ± 5.9% | 20% | 18% | 7% | 9% | 23% | 14% | – | 6% | 3% |
| YouGov/University of Houston | Feb 6–18, 2020 | 1,352 (LV) | ± 2.7% | 20% | 12% | 11% | 7% | 20% | 17% | – | 8% | 5% |
| | Feb 11, 2020 | New Hampshire primary; Yang withdraws from the race | New Hampshire primary; Yang withdraws from the race | New Hampshire primary; Yang withdraws from the race | New Hampshire primary; Yang withdraws from the race | New Hampshire primary; Yang withdraws from the race | New Hampshire primary; Yang withdraws from the race | New Hampshire primary; Yang withdraws from the race | New Hampshire primary; Yang withdraws from the race | New Hampshire primary; Yang withdraws from the race | New Hampshire primary; Yang withdraws from the race | New Hampshire primary; Yang withdraws from the race | New Hampshire primary; Yang withdraws from the race |
| YouGov/University of Texas/Texas Tribune | Jan 31-Feb 9, 2020 | 575 (LV) | ± 4.09% | 22% | 10% | 7% | 3% | 24% | 15% | 6% | 13% | – |
| University of Texas At Tyler/Dallas News | Jan 21–30, 2020 | 372 (LV) | ± 4.8% | 34% | 16% | 4% | 3% | 18% | 17% | 3% | 5% | – |
| Data for Progress | Jan 16–21, 2020 | 615 (LV) | ± 6.5% | 26% | 7% | 10% | 4% | 20% | 14% | 3% | 3% | 12% |
| Texas Lyceum | Jan 10–19, 2020 | 401 (LV) | ± 4.89% | 28% | 9% | 6% | 4% | 26% | 13% | 0% | 5% | 7% |
| | Jan 13, 2020 | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race |
| | Jan 2, 2020 | Castro withdraws from the race | Castro withdraws from the race | Castro withdraws from the race | Castro withdraws from the race | Castro withdraws from the race | Castro withdraws from the race | Castro withdraws from the race | Castro withdraws from the race | Castro withdraws from the race | Castro withdraws from the race | Castro withdraws from the race | Castro withdraws from the race |
Polling before January 2020 :
| Poll source | Date(s) administered | Sample size | Margin of error | Joe Biden | Cory Booker | Pete Buttigieg | Julian Castro | Kamala Harris | Amy Klobuchar | Beto O'Rourke | Bernie Sanders | Elizabeth Warren | Andrew Yang | Other | Undecided |
| CNN/SSRS | Dec 4–8, 2019 | 327 (LV) | ± 6.6% | 35% | 2% | 9% | 3% | – | 1% | – | 15% | 13% | 3% | 11% | 9% |
| | Dec 3, 2019 | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race |
| | Nov 24, 2019 | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy |
| University of Texas at Tyler | Nov 5–14, 2019 | 427 (RV) | ± 4.7% | 28% | 1% | 8% | 3% | 5% | 2% | – | 18% | 19% | 2% | 4% | – |
| | Nov 1, 2019 | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race |
| University of Texas/ Texas Tribune | Oct 18–27, 2019 | 541 | ± 4.2% | 23% | 1% | 6% | 2% | 5% | 2% | 14% | 12% | 18% | 4% | 4% | 5% |
| University of Texas at Tyler | Sep 13–15, 2019 | 474 (RV) | ± 4.5% | 28% | 6% | 4% | 4% | 6% | 0% | 19% | 17% | 11% | 1% | 5% | – |
| Texas Tribune | Aug 29–Sep 15, 2019 | 550 | ± 4.2% | 26% | 1% | 4% | 3% | 5% | 1% | 14% | 12% | 18% | 3% | 4% | 6% |
| Quinnipiac University | Sep 4–9, 2019 | 456 | ± 5.5% | 28% | 1% | 3% | 3% | 5% | 2% | 12% | 12% | 18% | 1 | 1% | 12% |
| Univision/University of Houston | Aug 31– Sep 6, 2019 | 1004 (RV) | ± 4.5% | 20% | 3% | 1% | 12% | 5% | – | 19% | 13% | 12% | 1% | 4% | 10% |
| Ragnar Research | Sep 3–5, 2019 | 600 | ± 3.9% | 23% | 1% | 6% | 2% | 7% | – | 12% | 12% | 15% | – | 7% | 18% |
| Climate Nexus | Aug 20–25, 2019 | 639 | – | 24% | 2% | 3% | 3% | 7% | – | 21% | 12% | 12% | 1% | 5% | 9% |
| TEXAS LYCEUM | Aug 16–25, 2019 | 358 | ± 5.2% | 24% | 2% | 3% | 4% | 4% | 3% | 18% | 13% | 15% | 2% | 8% | 2% |
| Emerson College | Aug 1–3, 2019 | 400 | ± 4.9% | 28% | 2% | 7% | 2% | 5% | <1% | 19% | 16% | 14% | 3% | 5% | – |
| YouGov/CBS News | Jul 9–18, 2019 | 910 | ± 4.2% | 27% | 0% | 4% | 4% | 12% | 1% | 17% | 12% | 16% | 1% | 6% | – |
| YouGov/University of Texas | May 31 – Jun 9, 2019 | 483 | ± 5.0% | 23% | 1% | 8% | 3% | 5% | 1% | 15% | 12% | 14% | 0% | 8% | 7% |
| Quinnipiac University | May 29 – Jun 4, 2019 | 407 | ± 5.8% | 30% | 1% | 3% | 4% | 4% | <1% | 16% | 15% | 11% | 1% | 5% | 8% |
| Change Research | May 30 – Jun 3, 2019 | 1,218 | ± 2.8% | 24% | 1% | 8% | 2% | 8% | 1% | 27% | 13% | 12% | 1% | 2% | – |
| Emerson College | Apr 25–28, 2019 | 342 | ± 5.3% | 23% | 1% | 8% | 4% | 3% | 3% | 22% | 17% | 7% | 3% | 11% | – |
| | Apr 25, 2019 | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy |
| Change Research | Apr 18–22, 2019 | 1,578 | ± 2.5% | 20% | 2% | 15% | 4% | 5% | 1% | 25% | 19% | 5% | 1% | 2% | – |
| Change Research | Apr 18–22, 2019 | 1,578 | ± 2.5% | – | 4% | 21% | 5% | 8% | 1% | 33% | 23% | 5% | 0% | 0% | – |

## Utah primary

The Utah Democratic primary was held on March 3, 2020.
Polling Aggregation :
| Source of poll aggregation | Date updated | Dates polled | Bernie Sanders | Joe Biden | Michael Bloomberg | Elizabeth Warren | Tulsi Gabbard | Other/ Undecided |
| 270 to Win | March 3, 2020 | Feb 22–March 2, 2020 | 26.3% | 21.7% | 18.7% | 13.3% | 1.5% | 20.0% |
| FiveThirtyEight | March 3, 2020 | Until March 2, 2020 | 26.3% | 20.0% | 18.2% | 14.6% | 1.3% | 20.9% |
| Average | Average | Average | 26.3% | 20.9% | 18.5% | 14.0% | 1.4% | 20.5% |
| Utah primary results (March 3, 2020) | Utah primary results (March 3, 2020) | Utah primary results (March 3, 2020) | 36.1% | 18.4% | 15.4% | 16.2% | 0.8% | 13.0% |
Tabulation of individual polls of the 2020 Utah Democratic Primary :
| Poll source | Date(s) administered | Sample size | Margin of error | Joe Biden | Michael Bloomberg | Pete Buttigieg | Amy Klobuchar | Bernie Sanders | Elizabeth Warren | Andrew Yang | Other | Undecided |
| | Mar 2, 2020 | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race |
| Swayable | Mar 1–2, 2020 | 143 (LV) | ± 9.0% | 27% | 29% | 7% | 6% | 22% | 6% | – | 2% | – |
| Data for Progress | Feb 28–Mar 2, 2020 | 622 (LV) | ± 3.9% | 23% | 17% | 7% | 3% | 29% | 19% | – | 2% | – |
| | Mar 1, 2020 | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race |
| HarrisX/University of Utah/Deseret News | Feb 22–26, 2020 | 298 (LV) | ± 5.7% | 6% | 19% | 18% | 4% | 28% | 15% | – | 1% | 8% |
| | Feb 11, 2020 | New Hampshire primary; Yang withdraws from the race | New Hampshire primary; Yang withdraws from the race | New Hampshire primary; Yang withdraws from the race | New Hampshire primary; Yang withdraws from the race | New Hampshire primary; Yang withdraws from the race | New Hampshire primary; Yang withdraws from the race | New Hampshire primary; Yang withdraws from the race | New Hampshire primary; Yang withdraws from the race | New Hampshire primary; Yang withdraws from the race | New Hampshire primary; Yang withdraws from the race | New Hampshire primary; Yang withdraws from the race | New Hampshire primary; Yang withdraws from the race | New Hampshire primary; Yang withdraws from the race |
| Salt Lake Tribune/Suffolk | Jan 18–22, 2020 | 132 (LV) | ± 8.5% | 12% | 10% | 5% | 3% | 27% | 14% | 5% | 4% | 21% |

## Vermont primary

The Vermont Democratic primary was held on March 3, 2020.
Polling Aggregation :
| Source of poll aggregation | Date updated | Dates polled | Bernie Sanders | Elizabeth Warren | Joe Biden | Michael Bloomberg | Tulsi Gabbard | Other/ Undecided |
| 270 to Win | March 3, 2020 | February 4–March 2, 2020 | 52.0% | 14.0% | 10.7% | 10.3% | 1.0% | 12.0% |
| RealClear Politics | March 3, 2020 | Insufficient recent polling to supply an average. | Insufficient recent polling to supply an average. | Insufficient recent polling to supply an average. | Insufficient recent polling to supply an average. | Insufficient recent polling to supply an average. | Insufficient recent polling to supply an average. | Insufficient recent polling to supply an average. |
| FiveThirtyEight | March 3, 2020 | until March 2, 2020 | 53.0% | 14.2% | 10.4% | 8.9% | 0.9% | 12.6% |
| Average | Average | Average | 52.5% | 14.1% | 10.55% | 9.6% | 0.95% | 12.3% |
| Vermont primary results (March 3, 2020) | Vermont primary results (March 3, 2020) | Vermont primary results (March 3, 2020) | 50.6% | 12.5% | 21.9% | 9.4% | 0.8% | 4.8% |
Tabulation of individual polls of the 2020 Vermont Democratic Primary :
| Poll source | Date(s) administered | Sample size | Margin of error | Joe Biden | Michael Bloomberg | Pete Buttigieg | Amy Klobuchar | Bernie Sanders | Elizabeth Warren | Other | Un- decided |
| | Mar 2, 2020 | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race |
| Swayable | Mar 1–2, 2020 | 147 (LV) | ± 11.0% | 11% | 16% | 5% | 2% | 48% | 17% | 2% | – |
| Data for Progress | Feb 28–Mar 2, 2020 | 236 (LV) | ± 6.9% | 16% | 8% | 1% | – | 57% | 16% | 2% | – |
| | Mar 1, 2020 | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race |
| Vermont Public Radio | Feb 4–10, 2020 | 332 (LV) | ± 4.0% | 5% | 7% | 9% | 4% | 51% | 13% | 2% | 7% |

## Virginia primary

The Virginia Democratic primary was held on March 3, 2020.
Polling Aggregation :
| Source of poll aggregation | Date updated | Dates Polled | Joe Biden | Bernie Sanders | Michael Bloomberg | Elizabeth Warren | Tulsi Gabbard | Un- decided |
| 270 to Win | March 3, 2020 | Until March 3, 2020 | 28.8% | 20.0% | 17.3% | 10.3% | 0.7% | 23.9% |
| RealClear Politics | March 3, 2020 | Until March 3, 2020 | 44.0% | 24.5% | 14.0% | 15.0% | 0.0% | 2.5% |
| FiveThirtyEight | Mar 3, 2020 | until Mar 3, 2020 | 39.9% | 21.0% | 13.2% | 12.3% | 0.5% | 13.1% |
| Average | Average | Average | 37.6% | 21.8% | 14.1% | 12.5% | 0.4% | 13.2% |
| Virginia primary results (March 3, 2020) | Virginia primary results (March 3, 2020) | Virginia primary results (March 3, 2020) | 53.3% | 23.1% | 9.7% | 10.8% | 0.9% | 2.2% |
Tabulation of individual polls of the 2020 Virginia Democratic Primary :
| Poll source | Date(s) administered | Sample size | Margin of error | Joe Biden | Michael Bloomberg | Cory Booker | Pete Buttigieg | Kamala Harris | Amy Klobuchar | Beto O'Rourke | Bernie Sanders | Elizabeth Warren | Other | Un- decided |
| | Mar 2, 2020 | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race |
| Swayable | Mar 1–2, 2020 | 1,435 (LV) | ± 4.0% | 36% | 20% | – | 4% | – | 3% | – | 20% | 11% | 6% | – |
| AtlasIntel | Mar 1–2, 2020 | 545 (LV) | ± 4.0% | 42% | 11% | – | 1% | – | 1% | – | 28% | 10% | 3% | 4% |
| Change Research | Mar 1–2, 2020 | 510 (LV) | – | 45% | 10% | – | – | – | 4% | – | 25% | 13% | 3% | – |
| Data for Progress | Feb 28–Mar 2, 2020 | 327 (LV) | ± 5.4% | 39% | 18% | – | – | – | – | – | 24% | 17% | 1% | – |
| | Mar 1, 2020 | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race |
| Data for Progress | Feb 23 – 25, 2020 | 499 (LV) | ± 4.5% | 19% | 17% | – | 12% | – | 5% | – | 28% | 17% | 2% | – |
| Monmouth University | Feb 13 – 16, 2020 | 400 (LV) | ± 4.9% | 18% | 22% | – | 11% | – | 9% | – | 22% | 5% | 1% | 11% |
| Monmouth University | Feb 13 – 16, 2020 | 400 (LV) | ± 4.9% | 51% | – | – | – | – | – | – | 38% | – | 4% | 7% |
| Monmouth University | Feb 13 – 16, 2020 | 400 (LV) | ± 4.9% | – | 47% | – | – | – | – | – | 41% | – | 5% | 7% |
| Monmouth University | Feb 13 – 16, 2020 | 400 (LV) | ± 4.9% | – | – | – | 42% | – | – | – | 44% | – | 7% | 7% |
| Monmouth University | Feb 13 – 16, 2020 | 400 (LV) | ± 4.9% | – | – | – | – | – | 42% | – | 45% | – | 6% | 7% |
| Christopher Newport University | Feb 3 – 23, 2020 | 561 (LV) | ± 4.3% | 22% | 13% | – | 8% | – | 5% | – | 17% | 8% | 6% | 16% |
| | Jan 13, 2020 | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race |
| | Dec 3, 2019 | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race |
| | Nov 24, 2019 | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy |
| | Nov 1, 2019 | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race |
| University of Mary Washington | Sep 3 – 15, 2019 | 882 (RV) | ± 3.3% | 23% | – | 1% | 4% | 5% | 2% | 1% | 9% | 9% | 46% | – |
| Hampton University | May 29 – Jun 6, 2019 | 1,126 (RV) | ± 4.3% | 36% | – | 2% | 11% | 7% | <1% | 3% | 17% | 13% | 10% | – |
| Change Research | Apr 26–30, 2019 | 551 (LV) | ± 4.2% | 41% | – | 3% | 12% | 5% | 1% | 4% | 20% | 10% | 5% | – |

## Idaho primary

The Idaho Democratic primary is scheduled to take place on March 10, 2020.
| Poll source | Date(s) administered | Sample size | Margin of error | Joe Biden | Tulsi Gabbard | Bernie Sanders | Other | Undecided |
| Swayable | Mar 8–9, 2020 | 833 (LV) | ± 7% | 52% | 2% | 37% | 9% | – |
| Data for Progress | Mar 7–9, 2020 | 329 (LV) | ± 5.4% | 51% | 2% | 47% | – | – |

## Michigan primary

The Michigan Democratic primary is scheduled to take place on March 10, 2020.
Polling aggregation :
| Source of poll aggregation | Date updated | Dates polled | Joe Biden | Bernie Sanders | Tulsi Gabbard | Other/ Undecided |
| 270 to Win | Mar 10, 2020 | Mar 4–9, 2020 | 57.0% | 32.3% | 1.3% | 9.4% |
| RealClear Politics | Mar 10, 2020 | Mar 4–9, 2020 | 55.7% | 33.3% | 1.3% | 9.7% |
| FiveThirtyEight | Mar 10, 2020 | until Mar 9, 2020 | 55.3% | 31.9% | 1.2% | 11.6% |
| Average | Average | Average | 56.0% | 32.5% | 1.3% | 10.2% |
| Michigan primary results (March 10, 2020) | Michigan primary results (March 10, 2020) | Michigan primary results (March 10, 2020) | 52.9% | 36.4% | 0.6% | 10.1% |
Tabulation of individual polls of the 2020 Michigan Democratic primary :
| Poll source | Date(s) administered | Sample size | Margin of error | Joe Biden | Michael Bloomberg | Cory Booker | Pete Buttigieg | Kamala Harris | Amy Klobuchar | Beto O'Rourke | Bernie Sanders | Elizabeth Warren | Andrew Yang | Other | Undecided |
| Swayable | Mar 9, 2020 | 3,126 (LV) | ± 3.0% | 62% | – | – | – | – | – | – | 28% | – | – | 10% | – |
| AtlasIntel | Mar 7–9, 2020 | 528 (LV) | ± 4.0% | 48% | 3% | – | – | – | – | – | 40% | 1% | – | 3% | 5% |
| Data for Progress | Mar 7–9, 2020 | 320 (LV) | ± 5.5% | 59% | – | – | – | – | – | – | 38% | – | – | 2% | – |
| Mitchell Research & Communications | Mar 8, 2020 | 602 (LV) | ± 4.0% | 54% | 1% | – | 1% | – | 1% | – | 33% | 3% | – | 3% | 5% |
| Target Insyght | Mar 8, 2020 | 600 (LV) | ± 4.0% | 65% | 2% | – | – | – | 1% | – | 24% | 3% | – | 3% | 1% |
| Concord Public Opinion Partners/ The Welcome Party | Mar 7–8, 2020 | 305 (LV) | – | 54% | – | – | – | – | – | – | 23% | – | – | 1% | 22% |
| YouGov/Yahoo News | Mar 6–8, 2020 | –(RV) | ± 5.8% | 54% | – | – | – | – | – | – | 42% | – | – | – | – |
| Monmouth University | Mar 5–8, 2020 | 411 (LV) | ± 4.8% | 51% | 3% | – | <1% | – | <1% | – | 36% | 1% | – | 7% | 2% |
| ROI Rocket | Mar 4–8, 2020 | 1,000 (LV) | ± 3.1% | 55% | – | – | – | – | – | – | 45% | – | – | – | – |
| The Progress Campaign (D) | Mar 3–7, 2020 | 417 (RV) | ± 4.7% | 51% | – | – | – | – | – | – | 44% | – | – | 1% | 4% |
| EPIC-MRA/Detroit Free Press | Mar 4–6, 2020 | 400 (LV) | ± 4.9% | 51% | – | – | – | – | – | – | 27% | – | – | 9% | 13% |
| | Mar 5, 2020 | Warren withdraws from the race | Warren withdraws from the race | Warren withdraws from the race | Warren withdraws from the race | Warren withdraws from the race | Warren withdraws from the race | Warren withdraws from the race | Warren withdraws from the race | Warren withdraws from the race | Warren withdraws from the race | Warren withdraws from the race | Warren withdraws from the race | Warren withdraws from the race | Warren withdraws from the race |
| | Mar 4, 2020 | Bloomberg withdraws from the race | Bloomberg withdraws from the race | Bloomberg withdraws from the race | Bloomberg withdraws from the race | Bloomberg withdraws from the race | Bloomberg withdraws from the race | Bloomberg withdraws from the race | Bloomberg withdraws from the race | Bloomberg withdraws from the race | Bloomberg withdraws from the race | Bloomberg withdraws from the race | Bloomberg withdraws from the race | Bloomberg withdraws from the race | Bloomberg withdraws from the race |
| | Mar 2, 2020 | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race |
| | Mar 1, 2020 | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race |
| GlenGariff Group Inc./Detroit News/WDIV-TV | Feb 28 – Mar 2, 2020 | 600 (LV) | ± 4.0% | 29% | 11% | – | 6% | – | 3% | – | 23% | 7% | – | 6% | 16% |
| | Feb 29, 2020 | South Carolina primary; Steyer withdraws from the race after close of polls | South Carolina primary; Steyer withdraws from the race after close of polls | South Carolina primary; Steyer withdraws from the race after close of polls | South Carolina primary; Steyer withdraws from the race after close of polls | South Carolina primary; Steyer withdraws from the race after close of polls | South Carolina primary; Steyer withdraws from the race after close of polls | South Carolina primary; Steyer withdraws from the race after close of polls | South Carolina primary; Steyer withdraws from the race after close of polls | South Carolina primary; Steyer withdraws from the race after close of polls | South Carolina primary; Steyer withdraws from the race after close of polls | South Carolina primary; Steyer withdraws from the race after close of polls | South Carolina primary; Steyer withdraws from the race after close of polls | South Carolina primary; Steyer withdraws from the race after close of polls | South Carolina primary; Steyer withdraws from the race after close of polls |
| YouGov/University of Wisconsin-Madison | Feb 11–20, 2020 | 662 (LV) | – | 16% | 13% | – | 11% | – | 8% | – | 25% | 13% | – | – | 14% |
| | Feb 11, 2020 | New Hampshire primary; Yang withdraws from the race after close of polls | New Hampshire primary; Yang withdraws from the race after close of polls | New Hampshire primary; Yang withdraws from the race after close of polls | New Hampshire primary; Yang withdraws from the race after close of polls | New Hampshire primary; Yang withdraws from the race after close of polls | New Hampshire primary; Yang withdraws from the race after close of polls | New Hampshire primary; Yang withdraws from the race after close of polls | New Hampshire primary; Yang withdraws from the race after close of polls | New Hampshire primary; Yang withdraws from the race after close of polls | New Hampshire primary; Yang withdraws from the race after close of polls | New Hampshire primary; Yang withdraws from the race after close of polls | New Hampshire primary; Yang withdraws from the race after close of polls | New Hampshire primary; Yang withdraws from the race after close of polls | New Hampshire primary; Yang withdraws from the race after close of polls |
| Baldwin Wallace University/Oakland University/Ohio Northern University | Jan 8–20, 2020 | 477 (RV) | – | 27% | 9.1% | – | 6.3% | – | 1.9% | – | 21.6% | 13.6% | 3.5% | 5.3% | 10.6% |
| | Jan 13, 2020 | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race |
| | Dec 3, 2019 | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race |
| | Nov 24, 2019 | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy |
| Emerson College | Oct 31 – Nov 3, 2019 | 454 | ± 4.6% | 34% | – | 3% | 8% | 3% | 0% | – | 28% | 19% | 2% | 3% | – |
| | Nov 1, 2019 | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race |
| Siena Research/New York Times | Oct 13–26, 2019 | 203 | – | 30% | – | 0% | 3% | 0% | 1% | 0% | 17% | 21% | 1% | 1% | 23% |
| Kaiser Family Foundation | Sep 23 – Oct 15, 2019 | 208 (LV) | – | 19% | – | 1% | 7% | 2% | 1% | 1% | 15% | 25% | 1% | 0% | 27% |
| Denno Research | Sep 21–24, 2019 | 217 | – | 27% | – | 1% | 4% | 4% | 1% | 1% | 12% | 23% | 1% | 4% | 23% |
| Climate Nexus | Jul 14–17, 2019 | 324 (LV) | – | 35% | – | 2% | 4% | 8% | 1% | 1% | 16% | 14% | 1% | 2% | 13% |
| Zogby Analytics | May 23–29, 2019 | 268 | ± 6.0% | 27% | – | 1% | 9% | 7% | 1% | 4% | 18% | 8% | 2% | 5% | – |
| Denno Research | May 8–10, 2019 | 235 | – | 37% | – | 3% | 5% | 4% | 1% | 1% | 16% | 9% | 0% | 4% | 23% |
| | Apr 25, 2019 | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy |
| | Apr 14, 2019 | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy |
| | Mar 14, 2019 | O'Rourke announces his candidacy | O'Rourke announces his candidacy | O'Rourke announces his candidacy | O'Rourke announces his candidacy | O'Rourke announces his candidacy | O'Rourke announces his candidacy | O'Rourke announces his candidacy | O'Rourke announces his candidacy | O'Rourke announces his candidacy | O'Rourke announces his candidacy | O'Rourke announces his candidacy | O'Rourke announces his candidacy | O'Rourke announces his candidacy | O'Rourke announces his candidacy |
| Emerson College | Mar 7–10, 2019 | 317 | ± 5.5% | 40% | – | 3% | 0% | 12% | 5% | 2% | 23% | 11% | – | 4% | – |

## Mississippi primary

The Mississippi Democratic primary is scheduled to take place on March 10, 2020.
Polling aggregation :
| Source of poll aggregation | Date updated | Dates polled | Joe Biden | Bernie Sanders | Tulsi Gabbard | Other/ Undecided |
| 270toWin | March 10, 2020 | March 4–9, 2020 | 72.5% | 25.0% | 0.5% | 2.0% |
| FiveThirtyEight | March 10, 2020 | until March 9, 2020 | 70.7% | 23.4% | 0.4% | 5.5% |
| Average | Average | Average | 71.6% | 24.2% | 0.5% | 3.7% |
| Mississippi primary results (March 10, 2020) | Mississippi primary results (March 10, 2020) | Mississippi primary results (March 10, 2020) | 81.1% | 14.8% | 0.4% | 3.7% |
Tabulation of individual polls of the 2020 Mississippi Democratic primary :
| Poll source | Date(s) administered | Sample size | Margin of error | Joe Biden | Cory Booker | Pete Buttigieg | Kamala Harris | Bernie Sanders | Elizabeth Warren | Other | Undecided |
| Swayable | Mar 8–9, 2020 | 1,247 (LV) | ± 4.0% | 68% | – | – | – | 28% | – | 4% | – |
| Data for Progress | Mar 4–7, 2020 | 340 (LV) | ± 5.1% | 77% | – | – | – | 22% | – | 1% | – |
| | Mar 5, 2020 | Warren withdraws from the race | Warren withdraws from the race | Warren withdraws from the race | Warren withdraws from the race | Warren withdraws from the race | Warren withdraws from the race | Warren withdraws from the race | Warren withdraws from the race | Warren withdraws from the race | Warren withdraws from the race | Warren withdraws from the race | Warren withdraws from the race | Warren withdraws from the race | Warren withdraws from the race |
| | Mar 4, 2020 | Bloomberg withdraws from the race | Bloomberg withdraws from the race | Bloomberg withdraws from the race | Bloomberg withdraws from the race | Bloomberg withdraws from the race | Bloomberg withdraws from the race | Bloomberg withdraws from the race | Bloomberg withdraws from the race | Bloomberg withdraws from the race | Bloomberg withdraws from the race | Bloomberg withdraws from the race | Bloomberg withdraws from the race | Bloomberg withdraws from the race | Bloomberg withdraws from the race |
| | Mar 2, 2020 | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race |
| | Mar 1, 2020 | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race |
| | Jan 13, 2020 | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race |
| | Dec 3, 2019 | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race |
| NBC News/SurveyMonkey | Jul 2–16, 2019 | 282 (RV) | ± 4.2% | 47% | 3% | 3% | 8% | 21% | 7% | 5% | 3% |
| Chism Strategies/Millsaps College | Jun 20–21, 2019 | 523 (LV) | ± 4.3% | 50% | 2% | 2% | 5% | 7% | 7% | 6% | 21% |

## Missouri primary

The Missouri Democratic primary is scheduled to take place on March 10, 2020.
Polling aggregation :
| Source of poll aggregation | Date updated | Dates polled | Joe Biden | Bernie Sanders | Tulsi Gabbard | Other/ Undecided |
| 270 to Win | March 10, 2020 | March 4–9, 2020 | 57.6% | 34.4% | 2.7% | 5.3% |
| RealClear Politics | March 10, 2020 | March 4–9, 2020 | 61.0% | 30.7% | 2.5% | 5.8% |
| FiveThirtyEight | March 10, 2020 | until March 9, 2020 | 60.3% | 32.6% | 2.5% | 4.6% |
| Average | Average | Average | 59.6% | 32.6% | 2.6% | 5.2% |
| Missouri primary results (March 10, 2020) | Missouri primary results (March 10, 2020) | Missouri primary results (March 10, 2020) | 60.1% | 34.6% | 0.7% | 4.6% |
Tabulation of individual polls of the 2020 Missouri Democratic primary :
| Poll source | Date(s) administered | Sample size | Margin of error | Joe Biden | Michael Bloomberg | Pete Buttigieg | Kamala Harris | Amy Klobuchar | Beto O'Rourke | Bernie Sanders | Elizabeth Warren | Other | Undecided |
| Swayable | Mar 9, 2020 | 2,037 (LV) | ± 3.0% | 57% | – | – | – | – | – | 36% | – | 8% | – |
| Øptimus | Mar 7–9, 2020 | 402 (LV) | ± 5.4% | 68% | – | – | – | – | – | 29% | – | 3% | – |
| Data for Progress | Mar 4–7, 2020 | 348 (LV) | ± 5.3% | 62% | – | – | – | – | – | 32% | 4% | 2% | – |
| | Mar 5, 2020 | Warren withdraws from the race | Warren withdraws from the race | Warren withdraws from the race | Warren withdraws from the race | Warren withdraws from the race | Warren withdraws from the race | Warren withdraws from the race | Warren withdraws from the race | Warren withdraws from the race | Warren withdraws from the race | Warren withdraws from the race | Warren withdraws from the race | Warren withdraws from the race | Warren withdraws from the race |
| Remington Research Group/Missouri Scout | Mar 4–5, 2020 | 1,040 (LV) | ± 3.0% | 53% | – | – | – | – | – | 31% | – | 10% | 6% |
| Emerson Polling/Nexstar | Mar 4–5, 2020 | 425 (LV) | ± 4.7% | 48% | – | – | – | – | – | 44% | – | 8% | <6% |
| | Mar 4, 2020 | Bloomberg withdraws from the race | Bloomberg withdraws from the race | Bloomberg withdraws from the race | Bloomberg withdraws from the race | Bloomberg withdraws from the race | Bloomberg withdraws from the race | Bloomberg withdraws from the race | Bloomberg withdraws from the race | Bloomberg withdraws from the race | Bloomberg withdraws from the race | Bloomberg withdraws from the race | Bloomberg withdraws from the race | Bloomberg withdraws from the race | Bloomberg withdraws from the race |
| | Mar 2, 2020 | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race |
| | Mar 1, 2020 | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race |
| The Progress Campaign (D) | Feb 16–23, 2020 | 294 (RV) | ± 5.1% | 29% | 14% | 13% | – | 4% | – | 23% | 12% | 4% | – |
| Americana Analytics | Feb 20–21, 2020 | 1,198 (LV) | ± 2.83% | 22% | 17% | 11% | – | 9% | – | 11% | 10% | 1% | 17% |
| Remington Research Group | Jan 22–23, 2020 | 1,460 (LV) | – | 39% | 14% | 6% | – | 8% | – | 7% | 9% | 3% | 14% |
| | Dec 3, 2019 | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race |
| | Nov 1, 2019 | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race |
| Show Me Victories | Sept 13–16, 2019 | 400 | ± 5% | 34% | – | 10% | 9% | 1% | 4% | 14% | 22% | 8% | – |
| Remington Research Group | Jul 10–11, 2019 | 1,122 | – | 43% | – | 5% | 13% | – | 1% | 4% | 15% | – | 19% |

## North Dakota caucus

The North Dakota Democratic caucus is scheduled to take place on March 10, 2020.
| Poll source | Date(s) administered | Sample size | Margin of error | Joe Biden | Tulsi Gabbard | Bernie Sanders | Other | Undecided |
| Swayable | Mar 7–9, 2020 | 383 (LV) | ± 9% | 65% | 0% | 31% | 4% | – |

## Washington primary

The Washington Democratic primary is scheduled to take place on March 10, 2020.
Polling aggregation :
| Source of poll aggregation | Date updated | Dates polled | Joe Biden | Bernie Sanders | Tulsi Gabbard | Un- decided |
| 270 to Win | Mar 10, 2020 | Feb 15 – Mar 9, 2020 | 33.5% | 34.0% | 1.3% | 34.7% |
| RealClear Politics | Mar 9, 2020 | No averages at this time | No averages at this time | No averages at this time | No averages at this time | No averages at this time |
| FiveThirtyEight | Mar 10, 2020 | until Mar 9, 2020 | 39.8% | 37.1% | 1.4% | 21.7% |
| Average | Average | Average | 36.65% | 36.55% | 1.35% | 28.2% |
Tabulation of individual polls of the 2020 Washington Democratic primary :
| Poll source | Date(s) administered | Sample size | Margin of error | Joe Biden | Michael Bloomberg | Pete Buttigieg | Kamala Harris | Jay Inslee | Amy Klobuchar | Bernie Sanders | Elizabeth Warren | Andrew Yang | Other | Undecided |
| Swayable | Mar 9, 2020 | 1,840 (LV) | ± 3.0% | 39% | – | – | – | – | – | 37% | – | – | 25% | – |
| Data for Progress | Mar 7–9, 2020 | 497 (LV) | ± 5.1% | 49% | – | – | – | – | – | 43% | 6% | – | 2% | – |
| Survey USA/KING-TV | Mar 4–6, 2020 | 550 (LV) | ± 5.4% | 36% | – | – | – | – | – | 35% | 10% | – | 13% | 5% |
| | Mar 5, 2020 | Warren withdraws from the race | Warren withdraws from the race | Warren withdraws from the race | Warren withdraws from the race | Warren withdraws from the race | Warren withdraws from the race | Warren withdraws from the race | Warren withdraws from the race | Warren withdraws from the race | Warren withdraws from the race | Warren withdraws from the race | Warren withdraws from the race | Warren withdraws from the race | Warren withdraws from the race |
| Data for Progress | Mar 4–5, 2020 | 737 (LV) | ± 3.6% | 47% | – | – | – | – | – | 44% | 5% | – | 3% | – |
| | Mar 4, 2020 | Bloomberg withdraws from the race | Bloomberg withdraws from the race | Bloomberg withdraws from the race | Bloomberg withdraws from the race | Bloomberg withdraws from the race | Bloomberg withdraws from the race | Bloomberg withdraws from the race | Bloomberg withdraws from the race | Bloomberg withdraws from the race | Bloomberg withdraws from the race | Bloomberg withdraws from the race | Bloomberg withdraws from the race | Bloomberg withdraws from the race | Bloomberg withdraws from the race |
| | Mar 2, 2020 | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race |
| | Mar 1, 2020 | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race |
| Elway Research/Cascade Public Media | Feb 15–18, 2020 | 404 (LV) | ± 5.0% | 10% | 15% | 9% | – | – | 11% | 21% | 11% | 0% | 2% | 22% |
| | Feb 11, 2020 | Yang withdraws from the race | Yang withdraws from the race | Yang withdraws from the race | Yang withdraws from the race | Yang withdraws from the race | Yang withdraws from the race | Yang withdraws from the race | Yang withdraws from the race | Yang withdraws from the race | Yang withdraws from the race | Yang withdraws from the race | Yang withdraws from the race | Yang withdraws from the race |
| Survey USA/KING-TV | Jan 26–28, 2020 | 536 (LV) | ± 6.2% | 21% | 12% | 8% | – | – | 3% | 26% | 16% | 4% | 2% | 7% |
| | Dec 3, 2019 | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race |
| | Aug 21, 2019 | Inslee withdraws from the race | Inslee withdraws from the race | Inslee withdraws from the race | Inslee withdraws from the race | Inslee withdraws from the race | Inslee withdraws from the race | Inslee withdraws from the race | Inslee withdraws from the race | Inslee withdraws from the race | Inslee withdraws from the race | Inslee withdraws from the race | Inslee withdraws from the race | Inslee withdraws from the race |
| Zogby Analytics | Jul 22 – Aug 1, 2019 | 1,265 (LV) | ± 2.8% | 19% | – | 5% | 9% | 6% | 1% | 18% | 14% | 2% | 11% | 16% |

## Arizona primary

The Arizona Democratic primary is scheduled to take place on March 17, 2020.
Polling aggregation :
| Source of poll aggregation | Date updated | Dates polled | Joe Biden | Bernie Sanders | Tulsi Gabbard | Other/ Undecided |
| 270 to Win | Mar 17, 2020 | Mar 3–16, 2020 | 50.6% | 29.4% | 1.0% | 19.0% |
| RealClear Politics | Mar 17, 2020 | Mar 6–15, 2020 | 51.7% | 33.7% | 1.0% | 13.6% |
| FiveThirtyEight | Mar 17, 2020 | until Mar 16, 2020 | 51.6% | 26.9% | 1.1% | 20.4% |
| Average | Average | Average | 51.3% | 30.0% | 1.0% | 17.7% |
Tabulation of individual polls of the 2020 Arizona Democratic primary :
| Poll source | Date(s) administered | Sample size | Margin of error | Joe Biden | Michael Bloomberg | Pete Buttigieg | Kamala Harris | Bernie Sanders | Elizabeth Warren | Andrew Yang | Other | Undecided |
| Swayable | Mar 16, 2020 | 1,167 (LV) | ± 5.0% | 53% | – | – | – | 29% | – | – | 19% | – |
| Marist/NBC News | Mar 10–15, 2020 | 523 (LV) | ± 6.0% | 53% | – | – | – | 36% | – | – | 8% | 3% |
| Marist/NBC News | Mar 10–15, 2020 | 913 (RV) | ± 4.5% | 50% | – | – | – | 37% | – | – | 9% | 5% |
| Monmouth University | Mar 11–14, 2020 | 373 (LV) | ± 5.1% | 51% | 5% | 3% | – | 31% | 3% | – | 2% | 5% |
| Latino Decisions/Univision/ Arizona State University | Mar 6–11, 2020 | 541 (LV) | ± 4.2% | 57% | – | – | – | 38% | – | – | – | 5% |
| Latino Decisions/Univision/ Arizona State University | Mar 6–11, 2020 | 541 (LV) | ± 4.2% | 51% | – | – | – | 34% | – | – | 6% | 8% |
| | March 4–5, 2020 | Bloomberg and Warren withdraw from the race | Bloomberg and Warren withdraw from the race | Bloomberg and Warren withdraw from the race | Bloomberg and Warren withdraw from the race | Bloomberg and Warren withdraw from the race | Bloomberg and Warren withdraw from the race | Bloomberg and Warren withdraw from the race | Bloomberg and Warren withdraw from the race | Bloomberg and Warren withdraw from the race | Bloomberg and Warren withdraw from the race | Bloomberg and Warren withdraw from the race |
| OH Predictive Insights | Mar 3–4, 2020 | 398 (LV) | ± 4.9% | 45% | 12% | – | – | 17% | 13% | – | 4% | 9% |
| | March 1–2, 2020 | Buttigieg and Klobuchar withdraw from the race | Buttigieg and Klobuchar withdraw from the race | Buttigieg and Klobuchar withdraw from the race | Buttigieg and Klobuchar withdraw from the race | Buttigieg and Klobuchar withdraw from the race | Buttigieg and Klobuchar withdraw from the race | Buttigieg and Klobuchar withdraw from the race | Buttigieg and Klobuchar withdraw from the race | Buttigieg and Klobuchar withdraw from the race | Buttigieg and Klobuchar withdraw from the race | Buttigieg and Klobuchar withdraw from the race |
| | February 11, 2020 | New Hampshire primary; Yang withdraws from the race after close of polls | New Hampshire primary; Yang withdraws from the race after close of polls | New Hampshire primary; Yang withdraws from the race after close of polls | New Hampshire primary; Yang withdraws from the race after close of polls | New Hampshire primary; Yang withdraws from the race after close of polls | New Hampshire primary; Yang withdraws from the race after close of polls | New Hampshire primary; Yang withdraws from the race after close of polls | New Hampshire primary; Yang withdraws from the race after close of polls | New Hampshire primary; Yang withdraws from the race after close of polls | New Hampshire primary; Yang withdraws from the race after close of polls | New Hampshire primary; Yang withdraws from the race after close of polls |
| | Dec 3, 2019 | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race |
| OH Predictive Insights | Oct 31 – Nov 8, 2019 | 260 (LV) | ± 6.1% | 29% | – | 9% | 5% | 16% | 18% | 4% | 19% | – |
| Emerson Polling | Oct 25–28, 2019 | 339 | ± 5.2% | 28% | – | 12% | 4% | 21% | 21% | 5% | 7% | – |
| Siena Research/New York Times | Oct 13–26, 2019 | 209 | – | 24% | – | 5% | 3% | 16% | 15% | 1% | 1% | 31% |
| Change Research | Sep 27–28, 2019 | 396 (LV) | – | 15% | – | 13% | 4% | 19% | 35% | 8% | 7% | – |
| Bendixen&Amandi | Sep 9–12, 2019 | 250 | ± 4.3% | 29% | – | 5% | 4% | 18% | 24% | 2% | 8% | 10% |
| Zogby Analytics | May 23–29, 2019 | 197 | ± 7.0% | 35% | – | 6% | 4% | 16% | 10% | 0% | 11% | – |

## Florida primary

The Florida Democratic primary is scheduled to take place on March 17, 2020.
Polling Aggregation :
| Source of poll aggregation | Date updated | Dates polled | Joe Biden | Bernie Sanders | Tulsi Gabbard | Other/ Undecided |
| 270 to Win | Mar 17, 2020 | Mar 5–16, 2020 | 65.5% | 23.0% | 1.8% | 9.7% |
| RealClear Politics | Mar 17, 2020 | Mar 6–12, 2020 | 64.7% | 25.7% | 2.0% | 7.6% |
| FiveThirtyEight | Mar 17, 2020 | until Mar 16, 2020 | 63.8% | 24.7% | 1.4% | 10.1% |
| Average | Average | Average | 64.7% | 24.5% | 1.7% | 9.1% |
Polling from February 12, 2020, to March 17, 2020 :
| Poll source | Date(s) administered | Sample size | Margin of error | Joe Biden | Michael Bloomberg | Pete Buttigieg | Amy Klobuchar | Bernie Sanders | Elizabeth Warren | Other | Un- decided |
| Swayable | Mar 16, 2020 | 4,035 (LV) | ± 2.0% | 64% | – | – | – | 25% | – | 12% | – |
| AtlasIntel | Mar 14–16, 2020 | 532 (LV) | ± 4.0% | 67% | – | – | – | 27% | – | 4% | 2% |
| Point Blank Political | Mar 11–13, 2020 | 3,165 (LV) | ± 2.3% | 61% | – | – | – | 32% | – | – | 7% |
| Point Blank Political | Mar 11–13, 2020 | 3,165 (LV) | ± 2.3% | 57% | 2% | 2% | 0% | 29% | 4% | 1% | 5% |
| Emerson College/Nexstar | Mar 11–12, 2020 | 434 (LV) | ± 4.7% | 65% | – | – | – | 27% | – | 2% | 6% |
| Gravis Marketing | Mar 10–12, 2020 | 516 (LV) | ± 4.3% | 66% | – | – | – | 25% | – | – | 9% |
| ROI Rocket | Mar 6–12, 2020 | 877 (LV) | ± 3.3% | 67% | – | – | – | 27% | – | – | – |
| Latino Decisions/Univision | Mar 6–12, 2020 | 531 (LV) | ± 4.3% | 67% | – | – | – | 32% | – | – | 2% |
| Latino Decisions/Univision | Mar 6–12, 2020 | 531 (LV) | ± 4.3% | 63% | – | – | – | 25% | – | 8% | 4% |
| University of North Florida | Mar 5–10, 2020 | 1,502 (LV) | ± 2.5% | 66% | 2% | 1% | <1% | 22% | 2% | 1% | 7% |
| St Pete Polls/FloridaPolitics.com | Mar 6–8, 2020 | 2,480 (LV) | ± 2.0% | 69% | 5% | 2% | 1% | 14% | 1% | 0% | 9% |
| Point Blank Political | Mar 6–8, 2020 | 3,376 (LV) | ± 2.3% | 61% | – | – | – | 32% | – | – | 7% |
| Point Blank Political | Mar 6–8, 2020 | 3,376 (LV) | ± 2.3% | 55% | 2% | 2% | 1% | 29% | 4% | 2% | 7% |
| Florida Atlantic University | Mar 5–7, 2020 | 399 (LV) | ± 4.9% | 61% | – | – | – | 25% | – | 3% | 10% |
| | Mar 4–5, 2020 | Bloomberg and Warren withdraw from the race | Bloomberg and Warren withdraw from the race | Bloomberg and Warren withdraw from the race | Bloomberg and Warren withdraw from the race | Bloomberg and Warren withdraw from the race | Bloomberg and Warren withdraw from the race | Bloomberg and Warren withdraw from the race | Bloomberg and Warren withdraw from the race | Bloomberg and Warren withdraw from the race | Bloomberg and Warren withdraw from the race | Bloomberg and Warren withdraw from the race | Bloomberg and Warren withdraw from the race |
| St Pete Polls/FloridaPolitics.com | Mar 4, 2020 | 1,882 (LV) | ± 2.3% | 61% | 14% | 1% | 1% | 12% | 5% | 0% | 6% |
| | Mar 1–2, 2020 | Buttigieg and Klobuchar withdraw from the race | Buttigieg and Klobuchar withdraw from the race | Buttigieg and Klobuchar withdraw from the race | Buttigieg and Klobuchar withdraw from the race | Buttigieg and Klobuchar withdraw from the race | Buttigieg and Klobuchar withdraw from the race | Buttigieg and Klobuchar withdraw from the race | Buttigieg and Klobuchar withdraw from the race | Buttigieg and Klobuchar withdraw from the race | Buttigieg and Klobuchar withdraw from the race | Buttigieg and Klobuchar withdraw from the race | Buttigieg and Klobuchar withdraw from the race |
| St Pete Polls | Feb 25–26, 2020 | 2,788 (LV) | ± 1.9% | 34% | 25% | 8% | 4% | 13% | 5% | 1% | 10% |
| Saint Leo University | Feb 17–22, 2020 | 342 (LV) | – | 25% | 25% | 11% | 5% | 17% | 7% | 4% | 7% |
| Florida Southern College | Feb 17–21, 2020 | 313 (LV) | ± 5.54% | 22% | 23% | 9% | 5% | 18% | 12% | 1% | 9% |
| St Pete Polls | Feb 18–19, 2020 | 2,412 (LV) | ± 2.0% | 27% | 32% | 8% | 7% | 11% | 5% | 2% | 10% |
| Tel Opinion Research/Politico/ Let’s Preserve the American Dream | Feb 13–18, 2020 | 800 (LV) | ± 3.46% | 20% | 26% | 8% | 5% | 13% | 7% | 5% | 16% |
| St Pete Polls | Feb 12–13, 2020 | 3,047 (LV) | ± 1.8% | 26% | 27% | 11% | 9% | 10% | 5% | 1% | 11% |
Polling before February 11, 2020 :
| Poll source | Date(s) administered | Sample size | Margin of error | Joe Biden | Michael Bloomberg | Cory Booker | Pete Buttigieg | Kamala Harris | Amy Klobuchar | Beto O'Rourke | Bernie Sanders | Elizabeth Warren | Andrew Yang | Other | Un- decided |
| | Feb 11, 2020 | New Hampshire primary; Yang withdraws from the race after close of polls | New Hampshire primary; Yang withdraws from the race after close of polls | New Hampshire primary; Yang withdraws from the race after close of polls | New Hampshire primary; Yang withdraws from the race after close of polls | New Hampshire primary; Yang withdraws from the race after close of polls | New Hampshire primary; Yang withdraws from the race after close of polls | New Hampshire primary; Yang withdraws from the race after close of polls | New Hampshire primary; Yang withdraws from the race after close of polls | New Hampshire primary; Yang withdraws from the race after close of polls | New Hampshire primary; Yang withdraws from the race after close of polls | New Hampshire primary; Yang withdraws from the race after close of polls | New Hampshire primary; Yang withdraws from the race after close of polls | New Hampshire primary; Yang withdraws from the race after close of polls | New Hampshire primary; Yang withdraws from the race after close of polls |
| St. Pete Polls | Jan 27–28, 2020 | 2,590 (LV) | ± 1.9% | 41% | 17% | – | 6% | – | 5% | – | 9% | 7% | 2% | 2% | 10% |
| Tel Opinion Research/Let’s Preserve the American Dream/Politico | Jan 21–23, 2020 | 600 (LV) | ± 4% | 41% | – | – | – | – | – | – | 21% | 18% | – | – | 20% |
| Tel Opinion Research/Let’s Preserve the American Dream/Politico | Jan 21–23, 2020 | 600 (LV) | ± 4% | 29% | 4% | – | 4% | – | 4% | – | 17% | 12% | 2% | 2% | 28% |
| | Jan 13, 2020 | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race |
| Florida Atlantic University | Jan 9–12, 2020 | 494 | ± 4.4% | 42% | 7% | 3% | 3% | – | 6% | – | 16% | 10% | 5% | 5% | 4% |
| | Dec 3, 2019 | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race |
| | Nov 24, 2019 | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy |
| | Nov 1, 2019 | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race |
| Siena College/New York Times | Oct 13–26, 2019 | 650 (RV) | ± 4.4% | 27% | – | 0% | 5% | 1% | 2% | 0% | 13% | 19% | 0% | 1% | 29% |
| Tel Opinion Research | Sep 15–18, 2019 | 800 (LV) | ± 3.54% | 43% | – | – | – | – | – | – | 10% | 26% | – | – | 18% |
| Tel Opinion Research | Sep 15–18, 2019 | 800 (LV) | ± 3.54% | 37% | – | – | 5% | 6% | – | – | 9% | 18% | 2% | – | 20% |
| Tel Opinion Research | Sep 15–18, 2019 | 800 (LV) | ± 3.54% | 24% | – | – | 2% | 3% | – | – | 5% | 11% | 1% | 3% | 49% |
| Florida Atlantic University | Sep 12–15, 2019 | 407 | ± 4.9% | 34% | – | 1% | 5% | 4% | 0% | 2% | 14% | 24% | 2% | 8% | 6% |
| St. Pete Polls | Jun 22–23, 2019 | 2,022 | ± 2.2% | 47% | – | 3% | 8% | 6% | – | 2% | 8% | 12% | – | 7% | 6% |
| Change Research | Jun 16–17, 2019 | 1,130 | ± 2.9% | 33% | – | 2% | 15% | 7% | 2% | 3% | 20% | 15% | 3% | 2% | – |
| Quinnipiac University | Jun 12–17, 2019 | 417 | ± 5.8% | 41% | – | 1% | 8% | 6% | 1% | 1% | 14% | 12% | <1% | 1% | 12% |
| Climate Nexus | Jun 7–11, 2019 | 676 | ± 2.6% | 32% | – | 2% | 6% | 6% | 1% | 2% | 16% | 10% | 2% | 9% | 14% |
| Zogby Analytics | May 23–29, 2019 | 228 | ± 6.5% | 34% | – | 2% | 6% | 2% | 1% | 4% | 18% | 7% | 1% | 6% | – |
| Florida Atlantic University | May 16–19, 2019 | 403 | ± 4.9% | 39% | – | 1% | 9% | 7% | 1% | 5% | 12% | 12% | 1% | 14% | – |
| Tel Opinion Research* | May 8, 2019 | 800 | ± 3.5% | 39% | – | 1% | 3% | 5% | 1% | 1% | 16% | 5% | – | – | 28% |
| | Apr 25, 2019 | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy |
| | Apr 14, 2019 | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy |
| Tel Opinion Research* | Mar 21, 2019 | 800 | ± 3.5% | 37% | – | 2% | – | 4% | 1% | 5% | 13% | 6% | – | – | 31% |
| | Mar 14, 2019 | O'Rourke announces his candidacy | O'Rourke announces his candidacy | O'Rourke announces his candidacy | O'Rourke announces his candidacy | O'Rourke announces his candidacy | O'Rourke announces his candidacy | O'Rourke announces his candidacy | O'Rourke announces his candidacy | O'Rourke announces his candidacy | O'Rourke announces his candidacy | O'Rourke announces his candidacy | O'Rourke announces his candidacy | O'Rourke announces his candidacy | O'Rourke announces his candidacy |
| Bendixen & Amandi International | Mar 1–4, 2019 | 300 | – | 26% | 1% | 1% | 0% | 9% | 1% | 1% | 11% | 4% | 0% | 0% | 46% |
| | Feb 19, 2019 | Sanders announces his candidacy | Sanders announces his candidacy | Sanders announces his candidacy | Sanders announces his candidacy | Sanders announces his candidacy | Sanders announces his candidacy | Sanders announces his candidacy | Sanders announces his candidacy | Sanders announces his candidacy | Sanders announces his candidacy | Sanders announces his candidacy | Sanders announces his candidacy | Sanders announces his candidacy | Sanders announces his candidacy |
| | Feb 9, 2019 | Warren announces her candidacy | Warren announces her candidacy | Warren announces her candidacy | Warren announces her candidacy | Warren announces her candidacy | Warren announces her candidacy | Warren announces her candidacy | Warren announces her candidacy | Warren announces her candidacy | Warren announces her candidacy | Warren announces her candidacy | Warren announces her candidacy | Warren announces her candidacy | Warren announces her candidacy |
| | Feb 1, 2019 | Booker announces his candidacy | Booker announces his candidacy | Booker announces his candidacy | Booker announces his candidacy | Booker announces his candidacy | Booker announces his candidacy | Booker announces his candidacy | Booker announces his candidacy | Booker announces his candidacy | Booker announces his candidacy | Booker announces his candidacy | Booker announces his candidacy | Booker announces his candidacy | Booker announces his candidacy |
| | Jan 21, 2019 | Harris announces her candidacy | Harris announces her candidacy | Harris announces her candidacy | Harris announces her candidacy | Harris announces her candidacy | Harris announces her candidacy | Harris announces her candidacy | Harris announces her candidacy | Harris announces her candidacy | Harris announces her candidacy | Harris announces her candidacy | Harris announces her candidacy | Harris announces her candidacy | Harris announces her candidacy |
| Saint Leo University | May 25–31, 2018 | – | – | 21% | – | 3% | – | 4% | – | – | 11% | 7% | – | 34% | 17% |

## Illinois primary

The Illinois Democratic primary is scheduled to take place on March 17, 2020.
Polling aggregation :
| Source of poll aggregation | Date updated | Dates polled | Joe Biden | Bernie Sanders | Tulsi Gabbard | Un- decided |
| 270toWin | Mar 17, 2020 | Mar 7–16, 2020 | 58.6% | 30.2% | 2.0% | 9.2% |
| RealClear Politics | Mar 17, 2020 | Mar 10–12, 2020 | 60.0% | 30.5% | – | 9.5% |
| FiveThirtyEight | Mar 17, 2020 | until Mar 16, 2020 | 61.5% | 26.6% | 1.5% | 10.4% |
| Average | Average | Average | 60.0% | 29.1% | 1.8% | 9.1% |
Tabulation of individual polls of the 2020 Illinois Democratic primary :
| Poll source | Date(s) administered | Sample size | Margin of error | Joe Biden | Michael Bloomberg | Pete Buttigieg | Kamala Harris | Amy Klobuchar | Bernie Sanders | Elizabeth Warren | Other | Undecided |
| Swayable | Mar 16, 2020 | 1,861 (LV) | ± 3.0% | 63% | – | – | – | – | 28% | – | 10% | – |
| Emerson College/Nexstar | Mar 11–12, 2020 | 567 (LV) | ± 4.1% | 57% | – | – | – | – | 36% | – | 2% | 6% |
| Gravis Marketing | Mar 10–12, 2020 | 549 (LV) | ± 4.2% | 63% | – | – | – | – | 25% | – | – | 12% |
| ROI Rocket | Mar 6–12, 2020 | 960 (LV) | ± 3.1% | 57% | – | – | – | – | 34% | – | – | – |
| Victory Research | Mar 7–9, 2020 | 1,200 (LV) | ± 2.83% | 55% | – | – | – | – | 36% | – | 1% | 8% |
| Ogden & Fry/Northwest Side GOP Club | Mar 8, 2020 | 457(LV) | ± 4.58% | 64% | – | – | – | – | 32% | – | 4% | – |
| Ogden & Fry/Northwest Side GOP Club | Mar 8, 2020 | 457(LV) | ± 4.58% | 55% | – | – | – | – | 26% | – | 2% | 16% |
| | Mar 1–5, 2020 | Buttigieg, Klobuchar, Bloomberg, and Warren withdraw from the race | Buttigieg, Klobuchar, Bloomberg, and Warren withdraw from the race | Buttigieg, Klobuchar, Bloomberg, and Warren withdraw from the race | Buttigieg, Klobuchar, Bloomberg, and Warren withdraw from the race | Buttigieg, Klobuchar, Bloomberg, and Warren withdraw from the race | Buttigieg, Klobuchar, Bloomberg, and Warren withdraw from the race | Buttigieg, Klobuchar, Bloomberg, and Warren withdraw from the race | Buttigieg, Klobuchar, Bloomberg, and Warren withdraw from the race | Buttigieg, Klobuchar, Bloomberg, and Warren withdraw from the race | Buttigieg, Klobuchar, Bloomberg, and Warren withdraw from the race | Buttigieg, Klobuchar, Bloomberg, and Warren withdraw from the race | Buttigieg, Klobuchar, Bloomberg, and Warren withdraw from the race | Buttigieg, Klobuchar, Bloomberg, and Warren withdraw from the race | Buttigieg, Klobuchar, Bloomberg, and Warren withdraw from the race |
| Victory Research | Feb 17–19, 2020 | 1,200(LV) | ± 2.83% | 20.3% | 14.5% | 11.4% | – | 6.3% | 25.6% | 6.6% | 4.4% | 10.9% |
| Southern Illinois University | Feb 10–17, 2020 | 475 (LV) | ± 4.5% | 14% | 17% | 13% | – | 8% | 22% | 6% | 2% | 17% |
| | Dec 3, 2019 | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race |
| Victory Research | Nov 27 – Dec 1, 2019 | 1,500 (RV) | ±2.83% | 23.2% | 3.6% | 15.9% | 3.2% | 2.6% | 15.0% | 17.4% | 12.3% | 6.9% |
| Victory Research | Jul 26–29, 2019 | 1,200 | ± 2.83% | 36.1% | – | 9.3% | 8.6% | 1.7% | 15.2% | 12.8% | 9.2% | 7.3% |

## Wisconsin primary

The Wisconsin Democratic primary is scheduled to take place on April 7, 2020.
Polling aggregation :
| Source of poll aggregation | Date updated | Dates polled | Joe Biden | Bernie Sanders | Other/ Undecided |
| 270 to Win | April 5, 2020 | March 6–29, 2020 | 55.3% | 37.0% | 7.7% |
| RealClear Politics | April 5, 2020 | March 6–29, 2020 | 55.3% | 37.0% | 7.7% |
| FiveThirtyEight | April 5, 2020 | until March 29, 2020 | 51.6% | 36.0% | 12.4% |
| Average | Average | Average | 54.1% | 36.7% | 9.2% |
Tabulation of individual polls of the 2020 Wisconsin Democratic Primary :
| Poll source | Date(s) administered | Sample size | Margin of error | Joe Biden | Michael Bloomberg | Cory Booker | Pete Buttigieg | Kamala Harris | Amy Klobuchar | Bernie Sanders | Elizabeth Warren | Andrew Yang | Other | Un- decided |
| Marquette University Law School | Mar 24–29, 2020 | 394 (LV) | ± 5.9% | 62% | – | – | – | – | – | 34% | – | – | – | 4% |
| Public Policy Polling | Mar 10–11, 2020 | 898(LV) | – | 55% | – | – | – | – | – | 39% | – | – | 3% | 3% |
| YouGov/Yahoo News | Mar 6–8, 2020 | –(RV) | ± 6.4% | 49% | – | – | – | – | – | 38% | – | – | – | – |
| | Mar 1–5, 2020 | Buttigieg, Klobuchar, Bloomberg, and Warren withdraw from the race | Buttigieg, Klobuchar, Bloomberg, and Warren withdraw from the race | Buttigieg, Klobuchar, Bloomberg, and Warren withdraw from the race | Buttigieg, Klobuchar, Bloomberg, and Warren withdraw from the race | Buttigieg, Klobuchar, Bloomberg, and Warren withdraw from the race | Buttigieg, Klobuchar, Bloomberg, and Warren withdraw from the race | Buttigieg, Klobuchar, Bloomberg, and Warren withdraw from the race | Buttigieg, Klobuchar, Bloomberg, and Warren withdraw from the race | Buttigieg, Klobuchar, Bloomberg, and Warren withdraw from the race | Buttigieg, Klobuchar, Bloomberg, and Warren withdraw from the race | Buttigieg, Klobuchar, Bloomberg, and Warren withdraw from the race | Buttigieg, Klobuchar, Bloomberg, and Warren withdraw from the race | Buttigieg, Klobuchar, Bloomberg, and Warren withdraw from the race |
| Marquette University Law School | Feb 19–23, 2020 | 490 (LV) | ± 5.1% | 15% | 17% | – | 13% | – | 11% | 29% | 9% | – | 2% | 4% |
| YouGov/University of Wisconsin-Madison | Feb 11–20, 2020 | 428 (LV) | – | 13% | 13% | – | 12% | – | 9% | 30% | 12% | – | – | 11% |
| | Feb 11, 2020 | New Hampshire primary; Yang withdraws from the race after close of polls | New Hampshire primary; Yang withdraws from the race after close of polls | New Hampshire primary; Yang withdraws from the race after close of polls | New Hampshire primary; Yang withdraws from the race after close of polls | New Hampshire primary; Yang withdraws from the race after close of polls | New Hampshire primary; Yang withdraws from the race after close of polls | New Hampshire primary; Yang withdraws from the race after close of polls | New Hampshire primary; Yang withdraws from the race after close of polls | New Hampshire primary; Yang withdraws from the race after close of polls | New Hampshire primary; Yang withdraws from the race after close of polls | New Hampshire primary; Yang withdraws from the race after close of polls | New Hampshire primary; Yang withdraws from the race after close of polls | New Hampshire primary; Yang withdraws from the race after close of polls |
| Baldwin Wallace University/Oakland University/Ohio Northern University | Jan 8–20, 2020 | 464 (RV) | – | 21.8% | 8.4% | – | 7.7% | – | 3% | 28.4% | 14.7% | 2.2% | 2.5% | 10.9% |
| | Jan 13, 2020 | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race |
| Marquette University Law School | Jan 8–12, 2020 | 358 (LV) | ± 6.3% | 23% | 6% | 1% | 15% | – | 4% | 19% | 14% | 6% | 3% | 9% |
| Fox News | Jan 5–8, 2020 | 671 (LV) | ± 3.5% | 23% | 7% | 3% | 9% | – | 4% | 21% | 13% | 3% | 6% | 10% |
| Marquette University Law School | Dec 3–8, 2019 | 358 (LV) | ± 6.3% | 23% | 3% | 4% | 15% | – | 3% | 19% | 16% | 3% | 3% | 11% |
| | Dec 3, 2019 | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race |
| | Nov 24, 2019 | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy |
| Marquette University Law School | Nov 13–17, 2019 | 801 (RV) | – | 30% | – | 3% | 13% | 2% | 3% | 17% | 15% | 2% | 6% | 10% |
| Siena Research/New York Times | Oct 13–26, 2019 | 292 | – | 23% | – | 1% | 5% | 1% | 0% | 20% | 25% | 2% | 2% | 19% |
| Kaiser Family Foundation | Sep 23 – Oct 15, 2019 | 274 (LV) | – | 17% | – | 2% | 6% | 3% | 3% | 10% | 22% | 2% | 1% | 35% |
| Fox News | Sep 29 – Oct 2, 2019 | 663 (LV) | ± 3.5% | 28% | – | 2% | 7% | 5% | 2% | 17% | 22% | 2% | 5% | 9% |
| Marquette University Law School | Aug 25–29, 2019 | 444 (RV) | ± 5.3% | 28% | – | 1% | 6% | 3% | 1% | 20% | 17% | 2% | 5% | 13% |
| Change Research | Aug 9–11, 2019 | 935 (LV) | ± 3.2% | 20% | – | 1% | 9% | 5% | 2% | 24% | 29% | 2% | 5% | – |
| Change Research | Jun 29 – Jul 4, 2019 | 1261 (LV) | – | 18% | – | 3% | 15% | 17% | 1% | 19% | 19% | 1% | 6% | – |
| Zogby Analytics | May 23–29, 2019 | 238 (LV) | ± 6.4% | 28% | – | 2% | 7% | 7% | 3% | 13% | 14% | 0% | 2% | – |
| | Apr 25, 2019 | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy |
| Zogby Analytics | Apr 15–18, 2019 | 485 (LV) | ± 4.5% | 24% | – | 4% | 10% | 7% | 4% | 20% | 6% | 1% | 11% | 14% |
| | Apr 14, 2019 | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy |
| Emerson College | Mar 15–17, 2019 | 324 (LV) | ± 5.4% | 24% | – | 2% | 1% | 5% | 4% | 39% | 14% | 1% | 10% | – |

## Ohio primary

The Ohio Democratic primary was originally scheduled to take place on March 17, 2020. Due to the COVID-19 pandemic, the primary was delayed. Initially, the Governor suggested the primary be held on June 2, 2020, however, further deliberations resulted in the legislature and Governor agreeing on suspending in-person voting, and selecting a mail-in ballot deadline of April 28, 2020.
Polling Aggregation :
| Source of poll aggregation | Date updated | Dates polled | Joe Biden | Bernie Sanders | Other/ Undecided |
| 270 to Win | Mar 16, 2020 | Mar 10–13, 2020 | 57.5% | 35.0% | 7.5% |
| RealClear Politics | Mar 16, 2020 | Mar 10–13, 2020 | 57.5% | 35.0% | 7.5% |
| FiveThirtyEight | Mar 16, 2020 | until Mar 13, 2020 | 58.7% | 32.3% | 9.0% |
| Average | Average | Average | 57.9% | 34.1% | 8.0% |
Tabulation of individual polls of the 2020 Ohio Democratic primary :
| Poll source | Date(s) administered | Sample size | Margin of error | Joe Biden | Michael Bloomberg | Cory Booker | Pete Buttigieg | Kamala Harris | Bernie Sanders | Elizabeth Warren | Andrew Yang | Other | Undecided |
| | Apr 8, 2020 | Sanders suspends his campaign: Politico Story | Sanders suspends his campaign: Politico Story | Sanders suspends his campaign: Politico Story | Sanders suspends his campaign: Politico Story | Sanders suspends his campaign: Politico Story | Sanders suspends his campaign: Politico Story | Sanders suspends his campaign: Politico Story | Sanders suspends his campaign: Politico Story | Sanders suspends his campaign: Politico Story | Sanders suspends his campaign: Politico Story | Sanders suspends his campaign: Politico Story | Sanders suspends his campaign: Politico Story | Sanders suspends his campaign: Politico Story |
| Swayable | Mar 16, 2020 | 2,027 (LV) | ± 3.0% | 66% | – | – | – | – | 24% | – | – | 10% | – |
| Marist/NBC News | Mar 10–13, 2020 | 486 (LV) | ± 5.6% | 58% | – | – | – | – | 35% | – | – | 4% | 4% |
| Marist/NBC News | Mar 10–13, 2020 | 830 (RV) | ± 4.1% | 56% | – | – | – | – | 36% | – | – | 4% | 4% |
| Emerson College/Nexstar | Mar 11–12, 2020 | 464 (LV) | ± 4.5% | 57% | – | – | – | – | 35% | – | – | 1% | 7% |
| ROI Rocket | Mar 6–12, 2020 | 880 (LV) | ± 3.3% | 61% | – | – | – | – | 33% | – | – | – | – |
| | Mar 5, 2020 | Warren withdraws from the race | Warren withdraws from the race | Warren withdraws from the race | Warren withdraws from the race | Warren withdraws from the race | Warren withdraws from the race | Warren withdraws from the race | Warren withdraws from the race | Warren withdraws from the race | Warren withdraws from the race | Warren withdraws from the race | Warren withdraws from the race | Warren withdraws from the race |
| | Mar 4, 2020 | Bloomberg withdraws from the race: NYT Story | Bloomberg withdraws from the race: NYT Story | Bloomberg withdraws from the race: NYT Story | Bloomberg withdraws from the race: NYT Story | Bloomberg withdraws from the race: NYT Story | Bloomberg withdraws from the race: NYT Story | Bloomberg withdraws from the race: NYT Story | Bloomberg withdraws from the race: NYT Story | Bloomberg withdraws from the race: NYT Story | Bloomberg withdraws from the race: NYT Story | Bloomberg withdraws from the race: NYT Story | Bloomberg withdraws from the race: NYT Story | Bloomberg withdraws from the race: NYT Story |
| | Mar 2, 2020 | Klobuchar withdraws from the race: NYT Story | Klobuchar withdraws from the race: NYT Story | Klobuchar withdraws from the race: NYT Story | Klobuchar withdraws from the race: NYT Story | Klobuchar withdraws from the race: NYT Story | Klobuchar withdraws from the race: NYT Story | Klobuchar withdraws from the race: NYT Story | Klobuchar withdraws from the race: NYT Story | Klobuchar withdraws from the race: NYT Story | Klobuchar withdraws from the race: NYT Story | Klobuchar withdraws from the race: NYT Story | Klobuchar withdraws from the race: NYT Story | Klobuchar withdraws from the race: NYT Story |
| | Mar 1, 2020 | Buttigieg withdraws from the race: NYT Story | Buttigieg withdraws from the race: NYT Story | Buttigieg withdraws from the race: NYT Story | Buttigieg withdraws from the race: NYT Story | Buttigieg withdraws from the race: NYT Story | Buttigieg withdraws from the race: NYT Story | Buttigieg withdraws from the race: NYT Story | Buttigieg withdraws from the race: NYT Story | Buttigieg withdraws from the race: NYT Story | Buttigieg withdraws from the race: NYT Story | Buttigieg withdraws from the race: NYT Story | Buttigieg withdraws from the race: NYT Story | Buttigieg withdraws from the race: NYT Story |
| | Feb 29, 2020 | South Carolina primary; Steyer withdraws from the race after close of polls | South Carolina primary; Steyer withdraws from the race after close of polls | South Carolina primary; Steyer withdraws from the race after close of polls | South Carolina primary; Steyer withdraws from the race after close of polls | South Carolina primary; Steyer withdraws from the race after close of polls | South Carolina primary; Steyer withdraws from the race after close of polls | South Carolina primary; Steyer withdraws from the race after close of polls | South Carolina primary; Steyer withdraws from the race after close of polls | South Carolina primary; Steyer withdraws from the race after close of polls | South Carolina primary; Steyer withdraws from the race after close of polls | South Carolina primary; Steyer withdraws from the race after close of polls | South Carolina primary; Steyer withdraws from the race after close of polls | South Carolina primary; Steyer withdraws from the race after close of polls |
| | Feb 11, 2020 | New Hampshire primary; Yang and Bennet withdraw from the race after close of polls | New Hampshire primary; Yang and Bennet withdraw from the race after close of polls | New Hampshire primary; Yang and Bennet withdraw from the race after close of polls | New Hampshire primary; Yang and Bennet withdraw from the race after close of polls | New Hampshire primary; Yang and Bennet withdraw from the race after close of polls | New Hampshire primary; Yang and Bennet withdraw from the race after close of polls | New Hampshire primary; Yang and Bennet withdraw from the race after close of polls | New Hampshire primary; Yang and Bennet withdraw from the race after close of polls | New Hampshire primary; Yang and Bennet withdraw from the race after close of polls | New Hampshire primary; Yang and Bennet withdraw from the race after close of polls | New Hampshire primary; Yang and Bennet withdraw from the race after close of polls | New Hampshire primary; Yang and Bennet withdraw from the race after close of polls | New Hampshire primary; Yang and Bennet withdraw from the race after close of polls |
| | Feb 3, 2020 | Iowa Caucuses | Iowa Caucuses | Iowa Caucuses | Iowa Caucuses | Iowa Caucuses | Iowa Caucuses | Iowa Caucuses | Iowa Caucuses | Iowa Caucuses | Iowa Caucuses | Iowa Caucuses | Iowa Caucuses | Iowa Caucuses |
| Baldwin Wallace University/Oakland University/Ohio Northern University | Jan 8–20, 2020 | 428 (RV) | – | 32.1% | 10.1% | – | 6.1% | – | 20.8% | 10.7% | 2.1% | 5.7% | 9.8% |
| | Jan 13, 2020 | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race |
| | Jan 10, 2020 | Williamson withdraws from the race | Williamson withdraws from the race | Williamson withdraws from the race | Williamson withdraws from the race | Williamson withdraws from the race | Williamson withdraws from the race | Williamson withdraws from the race | Williamson withdraws from the race | Williamson withdraws from the race | Williamson withdraws from the race | Williamson withdraws from the race | Williamson withdraws from the race | Williamson withdraws from the race |
| | Jan 2, 2020 | Castro withdraws from the race | Castro withdraws from the race | Castro withdraws from the race | Castro withdraws from the race | Castro withdraws from the race | Castro withdraws from the race | Castro withdraws from the race | Castro withdraws from the race | Castro withdraws from the race | Castro withdraws from the race | Castro withdraws from the race | Castro withdraws from the race | Castro withdraws from the race |
| | Dec 3, 2019 | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race |
| | Nov 24, 2019 | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy |
| | Nov 1, 2019 | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race |
| | Oct 24, 2019 | Ryan withdraws from the race | Ryan withdraws from the race | Ryan withdraws from the race | Ryan withdraws from the race | Ryan withdraws from the race | Ryan withdraws from the race | Ryan withdraws from the race | Ryan withdraws from the race | Ryan withdraws from the race | Ryan withdraws from the race | Ryan withdraws from the race | Ryan withdraws from the race |
| Climate Nexus | Oct 1–7, 2019 | 443 (LV) | – | 32% | – | 3% | 5% | 6% | 13% | 21% | 3% | 17% | – |
| Emerson | Sep 29 – Oct 2, 2019 | 353 (LV) | ± 5.2% | 29% | – | 0% | 5% | 7% | 27% | 21% | 3% | 5% | 2% |
| Quinnipiac | Jul 17–22, 2019 | 556 | ± 5.1% | 31% | – | 1% | 6% | 14% | 14% | 13% | 1% | 6% | 11% |
| Zogby Analytics | May 23–29, 2019 | 222 | ± 6.6% | 29% | – | 3% | 6% | 5% | 19% | 12% | 3% | 6% | – |

## Kansas primary

The Kansas Democratic primary is scheduled to take place on May 2, 2020.
| Poll source | Date(s) administered | Sample size | Margin of error | Joe Biden | Tulsi Gabbard | Bernie Sanders | Other | Undecided |
| | Apr 8, 2020 | Sanders suspends campaign | Sanders suspends campaign | Sanders suspends campaign | Sanders suspends campaign | Sanders suspends campaign | Sanders suspends campaign | Sanders suspends campaign |
| | Mar 19, 2020 | Gabbard withdraws from the race | Gabbard withdraws from the race | Gabbard withdraws from the race | Gabbard withdraws from the race | Gabbard withdraws from the race | Gabbard withdraws from the race | Gabbard withdraws from the race |
| Public Policy Polling | Mar 10–11, 2020 | 550 (LV) | – | 59% | 3% | 35% | – | 4% |

## Oregon primary

The Oregon Democratic primary is scheduled to take place on May 19, 2020.
| Poll source | Date(s) administered | Sample size | Margin of error | Bernie Sanders | Joe Biden | Undecided | Beto O'Rourke | Kamala Harris | Elizabeth Warren | Cory Booker | Andrew Yang | Pete Buttigieg | Other |
| Zogby Analytics | Mar 18–19, 2019 | 238 | ± 6.4% | 27% | 26% | 11% | 8% | 6% | 6% | 4% | 4% | 3% | 7% |

## Delaware primary

The Delaware Democratic primary was scheduled to take place on April 28, 2020, but was delayed due to the COVID-19 pandemic, and will instead occur on June 2, 2020.
| Poll source | Date(s) administered | Sample size | Margin of error | Joe Biden | Cory Booker | Pete Buttigieg | Tulsi Gabbard | Kamala Harris | Bernie Sanders | Elizabeth Warren | Andrew Yang | Other | Undecided |
| | Apr 8, 2020 | Sanders suspends his campaign | Sanders suspends his campaign | Sanders suspends his campaign | Sanders suspends his campaign | Sanders suspends his campaign | Sanders suspends his campaign | Sanders suspends his campaign | Sanders suspends his campaign | Sanders suspends his campaign | Sanders suspends his campaign | Sanders suspends his campaign | Sanders suspends his campaign |
| | Mar 19, 2020 | Gabbard withdraws from the race | Gabbard withdraws from the race | Gabbard withdraws from the race | Gabbard withdraws from the race | Gabbard withdraws from the race | Gabbard withdraws from the race | Gabbard withdraws from the race | Gabbard withdraws from the race | Gabbard withdraws from the race | Gabbard withdraws from the race | Gabbard withdraws from the race | Gabbard withdraws from the race |
| | Mar 1–5, 2020 | Buttigieg, Klobuchar, Bloomberg, and Warren withdraw from the race | Buttigieg, Klobuchar, Bloomberg, and Warren withdraw from the race | Buttigieg, Klobuchar, Bloomberg, and Warren withdraw from the race | Buttigieg, Klobuchar, Bloomberg, and Warren withdraw from the race | Buttigieg, Klobuchar, Bloomberg, and Warren withdraw from the race | Buttigieg, Klobuchar, Bloomberg, and Warren withdraw from the race | Buttigieg, Klobuchar, Bloomberg, and Warren withdraw from the race | Buttigieg, Klobuchar, Bloomberg, and Warren withdraw from the race | Buttigieg, Klobuchar, Bloomberg, and Warren withdraw from the race | Buttigieg, Klobuchar, Bloomberg, and Warren withdraw from the race | Buttigieg, Klobuchar, Bloomberg, and Warren withdraw from the race | Buttigieg, Klobuchar, Bloomberg, and Warren withdraw from the race |
| | Jan 13, 2020 | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race |
| | Dec 3, 2019 | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race |
| Data For Progress | Nov 15–25, 2019 | 481 (LV) | – | 35% | 3% | 8% | 3% | 1% | 13% | 11% | 1% | 10% | 15% |

## Indiana primary

The Indiana Democratic primary was scheduled to take place on May 5, 2020, but was delayed due to the COVID-19 pandemic, and will instead occur on June 2, 2020.
| Poll source | Date(s) administered | Sample size | Margin of error | Joe Biden | Pete Buttigieg | Kamala Harris | Beto O'Rourke | Bernie Sanders | Elizabeth Warren | Other | Undecided |
| | Apr 8, 2020 | Sanders suspends his campaign | Sanders suspends his campaign | Sanders suspends his campaign | Sanders suspends his campaign | Sanders suspends his campaign | Sanders suspends his campaign | Sanders suspends his campaign | Sanders suspends his campaign | Sanders suspends his campaign | Sanders suspends his campaign |
| | Nov 1, 2019–March 5, 2020 | O'Rourke, Harris, Buttigieg and Warren withdraw from the race | O'Rourke, Harris, Buttigieg and Warren withdraw from the race | O'Rourke, Harris, Buttigieg and Warren withdraw from the race | O'Rourke, Harris, Buttigieg and Warren withdraw from the race | O'Rourke, Harris, Buttigieg and Warren withdraw from the race | O'Rourke, Harris, Buttigieg and Warren withdraw from the race | O'Rourke, Harris, Buttigieg and Warren withdraw from the race | O'Rourke, Harris, Buttigieg and Warren withdraw from the race | O'Rourke, Harris, Buttigieg and Warren withdraw from the race | O'Rourke, Harris, Buttigieg and Warren withdraw from the race |
| We Ask America | Apr 29–May 5, 2019 | 280 | ± 5.9% | 33% | 20% | 3% | 2% | 23% | 2% | 1% | 15% |

## Maryland primary

The Maryland Democratic primary was scheduled to take place on April 28, 2020, but was delayed due to the COVID-19 pandemic, and will instead occur on June 2, 2020.
| Poll source | Date(s) administered | Sample size | Margin of error | Joe Biden | Michael Bloomberg | Pete Buttigieg | Kamala Harris | Amy Klobuchar | Bernie Sanders | Elizabeth Warren | Other | Undecided |
| | Apr 8, 2020 | Sanders suspends his campaign | Sanders suspends his campaign | Sanders suspends his campaign | Sanders suspends his campaign | Sanders suspends his campaign | Sanders suspends his campaign | Sanders suspends his campaign | Sanders suspends his campaign | Sanders suspends his campaign | Sanders suspends his campaign | Sanders suspends his campaign |
| | Mar 1–5, 2020 | Buttigieg, Klobuchar, Bloomberg, and Warren withdraw from the race | Buttigieg, Klobuchar, Bloomberg, and Warren withdraw from the race | Buttigieg, Klobuchar, Bloomberg, and Warren withdraw from the race | Buttigieg, Klobuchar, Bloomberg, and Warren withdraw from the race | Buttigieg, Klobuchar, Bloomberg, and Warren withdraw from the race | Buttigieg, Klobuchar, Bloomberg, and Warren withdraw from the race | Buttigieg, Klobuchar, Bloomberg, and Warren withdraw from the race | Buttigieg, Klobuchar, Bloomberg, and Warren withdraw from the race | Buttigieg, Klobuchar, Bloomberg, and Warren withdraw from the race | Buttigieg, Klobuchar, Bloomberg, and Warren withdraw from the race | Buttigieg, Klobuchar, Bloomberg, and Warren withdraw from the race |
| Gonzales Research & Media Services | Feb 22–28, 2020 | 331 (LV) | ± 5.5% | 19% | 15% | 5% | – | 4% | 23% | 8% | – | 27% |
| Goucher College | Feb 13–19, 2020 | 371 (LV) | ± 5.1% | 18% | 16% | 7% | – | 6% | 24% | 6% | 4% | 18% |
| | Dec 3, 2019 | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race |
| Goucher College | Sept 13–19, 2019 | 300 (LV) | ± 5.6% | 33% | – | 5% | 6% | 1% | 10% | 21% | 9% | 15% |

## Montana primary

The Montana Democratic primary is scheduled to take place on June 2, 2020. Polls with a sample size of <100 are marked in red to indicate a lack of reliability.
| Poll source | Date(s) administered | Sample size | Margin of error | Joe Biden | Steve Bullock | Pete Buttigieg | Kamala Harris | Beto O'Rourke | Bernie Sanders | Elizabeth Warren | Andrew Yang | Other | Undecided |
| | Apr 8, 2020 | Sanders suspends his campaign | Sanders suspends his campaign | Sanders suspends his campaign | Sanders suspends his campaign | Sanders suspends his campaign | Sanders suspends his campaign | Sanders suspends his campaign | Sanders suspends his campaign | Sanders suspends his campaign | Sanders suspends his campaign | Sanders suspends his campaign | Sanders suspends his campaign |
| | Nov 1, 2019–March 5, 2020 | O'Rourke, Bullock, Harris, Yang, Buttigieg and Warren withdraw from the race | O'Rourke, Bullock, Harris, Yang, Buttigieg and Warren withdraw from the race | O'Rourke, Bullock, Harris, Yang, Buttigieg and Warren withdraw from the race | O'Rourke, Bullock, Harris, Yang, Buttigieg and Warren withdraw from the race | O'Rourke, Bullock, Harris, Yang, Buttigieg and Warren withdraw from the race | O'Rourke, Bullock, Harris, Yang, Buttigieg and Warren withdraw from the race | O'Rourke, Bullock, Harris, Yang, Buttigieg and Warren withdraw from the race | O'Rourke, Bullock, Harris, Yang, Buttigieg and Warren withdraw from the race | O'Rourke, Bullock, Harris, Yang, Buttigieg and Warren withdraw from the race | O'Rourke, Bullock, Harris, Yang, Buttigieg and Warren withdraw from the race | O'Rourke, Bullock, Harris, Yang, Buttigieg and Warren withdraw from the race | O'Rourke, Bullock, Harris, Yang, Buttigieg and Warren withdraw from the race |
| Montana State University Billings | Oct 7–16, 2019 | 40 (LV) | – | 15% | 5% | 2% | 2% | 5% | 2% | 40% | No voters | 2% | 25% |

## New Mexico primary

The New Mexico democratic primary is scheduled to take place on June 2, 2020.
| Poll source | Date(s) administered | Sample size | Margin of error | Joe Biden | Michael Bloomberg | Cory Booker | Pete Buttigieg | Tulsi Gabbard | Amy Klobuchar | Bernie Sanders | Elizabeth Warren | Andrew Yang | Other | Undecided |
| | Apr 8, 2020 | Sanders suspends his campaign | Sanders suspends his campaign | Sanders suspends his campaign | Sanders suspends his campaign | Sanders suspends his campaign | Sanders suspends his campaign | Sanders suspends his campaign | Sanders suspends his campaign | Sanders suspends his campaign | Sanders suspends his campaign | Sanders suspends his campaign | Sanders suspends his campaign | Sanders suspends his campaign |
| | Mar 1–19, 2020 | Buttigieg, Klobuchar, Bloomberg, Warren, and Gabbard withdraw from the race | Buttigieg, Klobuchar, Bloomberg, Warren, and Gabbard withdraw from the race | Buttigieg, Klobuchar, Bloomberg, Warren, and Gabbard withdraw from the race | Buttigieg, Klobuchar, Bloomberg, Warren, and Gabbard withdraw from the race | Buttigieg, Klobuchar, Bloomberg, Warren, and Gabbard withdraw from the race | Buttigieg, Klobuchar, Bloomberg, Warren, and Gabbard withdraw from the race | Buttigieg, Klobuchar, Bloomberg, Warren, and Gabbard withdraw from the race | Buttigieg, Klobuchar, Bloomberg, Warren, and Gabbard withdraw from the race | Buttigieg, Klobuchar, Bloomberg, Warren, and Gabbard withdraw from the race | Buttigieg, Klobuchar, Bloomberg, Warren, and Gabbard withdraw from the race | Buttigieg, Klobuchar, Bloomberg, Warren, and Gabbard withdraw from the race | Buttigieg, Klobuchar, Bloomberg, Warren, and Gabbard withdraw from the race | Buttigieg, Klobuchar, Bloomberg, Warren, and Gabbard withdraw from the race |
| | Jan 13–Feb 11, 2020 | Booker and Yang withdraw from the race | Booker and Yang withdraw from the race | Booker and Yang withdraw from the race | Booker and Yang withdraw from the race | Booker and Yang withdraw from the race | Booker and Yang withdraw from the race | Booker and Yang withdraw from the race | Booker and Yang withdraw from the race | Booker and Yang withdraw from the race | Booker and Yang withdraw from the race | Booker and Yang withdraw from the race | Booker and Yang withdraw from the race | Booker and Yang withdraw from the race |
| Emerson Polling | Jan 3–6, 2020 | 447 (RV) | ± 4.6% | 27% | 3% | 2% | 7% | 2% | 2% | 28% | 8% | 10% | 11% | - |

## Pennsylvania primary

The Pennsylvania Democratic primary was scheduled to take place on April 28, 2020, but was delayed due to the COVID-19 pandemic, and is instead scheduled for June 2, 2020.
Polling Aggregation :
| Source of poll aggregation | Date updated | Dates polled | Joe Biden | Bernie Sanders | Other/ Undecided |
| 270 to Win | Mar 18, 2020 | Feb 11–Mar 8, 2020 | 39.5% | 28.0% | 32.5% |
| RealClear Politics | Feb 23, 2020 | Jan 20–Feb 20, 2020 | 39.5% | 28.0% | 32.5% |
| FiveThirtyEight | Mar 8, 2020 | until Feb 20, 2020 | 54.4% | 29.3% | 16.3% |
| Average | Average | Average | 44.5% | 28.4% | 27.1% |
| Poll source | Date(s) administered | Sample size | Margin of error | Joe Biden | Michael Bloomberg | Cory Booker | Pete Buttigieg | Kamala Harris | Beto O'Rourke | Bernie Sanders | Elizabeth Warren | Other | Undecided |
| | Apr 8, 2020 | Sanders suspends his campaign | Sanders suspends his campaign | Sanders suspends his campaign | Sanders suspends his campaign | Sanders suspends his campaign | Sanders suspends his campaign | Sanders suspends his campaign | Sanders suspends his campaign | Sanders suspends his campaign | Sanders suspends his campaign | Sanders suspends his campaign | Sanders suspends his campaign |
| YouGov/Yahoo News | Mar 6–8, 2020 | –(RV) | ± 5.1% | 59% | – | – | – | – | – | 31% | – | – | – |
| | Mar 1–5, 2020 | Buttigieg, Klobuchar, Bloomberg and Warren withdraw from the race | Buttigieg, Klobuchar, Bloomberg and Warren withdraw from the race | Buttigieg, Klobuchar, Bloomberg and Warren withdraw from the race | Buttigieg, Klobuchar, Bloomberg and Warren withdraw from the race | Buttigieg, Klobuchar, Bloomberg and Warren withdraw from the race | Buttigieg, Klobuchar, Bloomberg and Warren withdraw from the race | Buttigieg, Klobuchar, Bloomberg and Warren withdraw from the race | Buttigieg, Klobuchar, Bloomberg and Warren withdraw from the race | Buttigieg, Klobuchar, Bloomberg and Warren withdraw from the race | Buttigieg, Klobuchar, Bloomberg and Warren withdraw from the race | Buttigieg, Klobuchar, Bloomberg and Warren withdraw from the race | Buttigieg, Klobuchar, Bloomberg and Warren withdraw from the race |
| YouGov/University of Wisconsin-Madison | Feb 11–20, 2020 | 537 (LV) | – | 20% | 19% | – | 12% | – | – | 25% | 9% | 5% | 10% |
| | Feb 11, 2020 | New Hampshire primary; Yang withdraws from the race after close of polls | New Hampshire primary; Yang withdraws from the race after close of polls | New Hampshire primary; Yang withdraws from the race after close of polls | New Hampshire primary; Yang withdraws from the race after close of polls | New Hampshire primary; Yang withdraws from the race after close of polls | New Hampshire primary; Yang withdraws from the race after close of polls | New Hampshire primary; Yang withdraws from the race after close of polls | New Hampshire primary; Yang withdraws from the race after close of polls | New Hampshire primary; Yang withdraws from the race after close of polls | New Hampshire primary; Yang withdraws from the race after close of polls | New Hampshire primary; Yang withdraws from the race after close of polls | New Hampshire primary; Yang withdraws from the race after close of polls |
| Franklin & Marshall College | Jan 20–26, 2020 | 292 (RV) | ± 9.0% | 22% | 7% | – | 6% | – | – | 15% | 14% | 18% | 19% |
| Baldwin Wallace University/Oakland University/Ohio Northern University | Jan 8–20, 2020 | 502 (RV) | – | 31.3% | 9.1% | – | 6.5% | – | – | 20.5% | 11.5% | 8.8% | 11% |
| | Dec 3, 2019–Jan 13, 2020 | Harris and Booker withdraw from the race | Harris and Booker withdraw from the race | Harris and Booker withdraw from the race | Harris and Booker withdraw from the race | Harris and Booker withdraw from the race | Harris and Booker withdraw from the race | Harris and Booker withdraw from the race | Harris and Booker withdraw from the race | Harris and Booker withdraw from the race | Harris and Booker withdraw from the race | Harris and Booker withdraw from the race | Harris and Booker withdraw from the race |
| | Nov 24, 2019 | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy |
| | Nov 1, 2019 | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race | O'Rourke withdraws from the race |
| Franklin & Marshall College | Oct 21–27, 2019 | 226 (RV) | ± 8.9% | 30% | – | 1% | 8% | 1% | <1% | 12% | 18% | 15% | 16% |
| Siena Research/New York Times | Oct 13–26, 2019 | 304 | – | 28% | – | 0% | 4% | 1% | 0% | 14% | 16% | 3% | 30% |
| Kaiser Family Foundation | Sep 23–Oct 15, 2019 | 246 (LV) | – | 27% | – | 1% | 3% | 4% | No voters | 14% | 18% | 5% | 29% |
| Susquehanna Polling and Research Inc. | Sep 30–Oct 6, 2019 | 307 (RV) | ± 5.6% | 17% | – | 0% | 8% | 1% | 0% | 6% | 9% | 7% | 52% |
| Franklin & Marshall College | Jul 29–Aug 4, 2019 | 295 | ± 8.7% | 28% | – | 2% | 6% | 8% | 1% | 12% | 21% | 3% | 19% |
| Zogby Analytics | May 23–29, 2019 | 246 | ± 6.3% | 46% | – | 2% | 9% | 3% | 2% | 15% | 8% | 2% | – |
| Quinnipiac University | May 9–14, 2019 | 431 | ± 6.2% | 39% | – | 5% | 6% | 8% | 2% | 13% | 8% | 3% | 12% |
| | Apr 25, 2019 | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy | Biden announces his candidacy |
| | Apr 14, 2019 | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy | Buttigieg announces his candidacy |
| Muhlenberg College | Apr 3–10, 2019 | 405 | ± 5.5% | 28% | – | 3% | 4% | 8% | 3% | 16% | 8% | 9% | 20% |
| Emerson College | Mar 26–28, 2019 | 359 | ± 5.1% | 39% | – | 4% | 6% | 5% | 5% | 20% | 11% | 10% | – |

## Georgia primary

The Georgia Democratic primary was originally scheduled to take place on March 24, 2020, but was delayed due to the COVID-19 pandemic, first to May 19, 2020, and then further delayed to June 9, 2020.
Polling aggregation :
| Source of poll aggregation | Date updated | Dates Polled | Joe Biden | Bernie Sanders | Undecided |
| FiveThirtyEight | Mar 14, 2020 | until Feb 13, 2020 | 67.3% | 30.1% | 2.6% |
| Poll source | Date(s) administered | Sample size | Margin of error | Joe Biden | Michael Bloomberg | Pete Buttigieg | Kamala Harris | Bernie Sanders | Elizabeth Warren | Andrew Yang | Other | Undecided |
| | Apr 8, 2020 | Sanders suspends his campaign | Sanders suspends his campaign | Sanders suspends his campaign | Sanders suspends his campaign | Sanders suspends his campaign | Sanders suspends his campaign | Sanders suspends his campaign | Sanders suspends his campaign | Sanders suspends his campaign | Sanders suspends his campaign | Sanders suspends his campaign |
| The Progress Campaign (D) | Mar 12–21, 2020 | 913 (RV) | ± 4.6% | 63% | – | – | – | 34% | – | – | – | 2.3% |
| University of Georgia | Mar 4–14, 2020 | 807 | ± 3.4% | 66% | – | – | – | 22% | – | – | 1% | 11% |
| | Mar 5, 2020 | Warren withdraws from the race | Warren withdraws from the race | Warren withdraws from the race | Warren withdraws from the race | Warren withdraws from the race | Warren withdraws from the race | Warren withdraws from the race | Warren withdraws from the race | Warren withdraws from the race | Warren withdraws from the race | Warren withdraws from the race |
| | Mar 4, 2020 | Bloomberg withdraws from the race | Bloomberg withdraws from the race | Bloomberg withdraws from the race | Bloomberg withdraws from the race | Bloomberg withdraws from the race | Bloomberg withdraws from the race | Bloomberg withdraws from the race | Bloomberg withdraws from the race | Bloomberg withdraws from the race | Bloomberg withdraws from the race | Bloomberg withdraws from the race |
| | Mar 1, 2020 | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race |
| Landmark Communications | Feb 12, 2020 | 500 | ± 4.3% | 32% | 14% | 5% | – | 14% | 4% | – | 6% | 26% |
| | Feb 11, 2020 | Yang withdraws from the race | Yang withdraws from the race | Yang withdraws from the race | Yang withdraws from the race | Yang withdraws from the race | Yang withdraws from the race | Yang withdraws from the race | Yang withdraws from the race | Yang withdraws from the race | Yang withdraws from the race | Yang withdraws from the race |
| | Dec 3, 2019 | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race |
| SurveyUSA | Nov 15–18, 2019 | 536 | ± 5.2% | 36% | 6% | 7% | 6% | 17% | 14% | – | 5% | 9% |
| Climate Nexus | Nov 4–10, 2019 | 457 | ± 3.6% | 31% | – | 4% | 4% | 14% | 14% | 2% | 11% | 19% |
| Landmark Communications | Sep 18–21, 2019 | 500 | ± 4.1% | 41% | – | 5% | 6% | 8% | 17% | 2% | 6% | 15% |
| Change Research | Sep 7–11, 2019 | 755 | ± 3.6% | 33% | – | 7% | 7% | 17% | 22% | 3% | 10% | – |
| SurveyMonkey | Jul 2–16, 2019 | 402 | ± 6.4% | 31% | – | 5% | 15% | 12% | 13% | 4% | 11% | 9% |

## New York primary

The New York Democratic primary was scheduled to take place on April 28, 2020, but was delayed due to the COVID-19 pandemic, and is instead scheduled for June 23, 2020.
Polling aggregation :
| Source of poll aggregation | Date updated | Dates polled | Joe Biden | Bernie Sanders | Other/ Undecided |
| FiveThirtyEight | Mar 18, 2020 | until Mar 18, 2020 | 51.7% | 28.9% | 21.4% |
| Poll source | Date(s) administered | Sample size | Margin of error | Joe Biden | Michael Bloomberg | Pete Buttigieg | Kamala Harris | Amy Klobuchar | Bernie Sanders | Elizabeth Warren | Other | Un- decided |
| | Apr 8, 2020 | Sanders suspends his campaign | Sanders suspends his campaign | Sanders suspends his campaign | Sanders suspends his campaign | Sanders suspends his campaign | Sanders suspends his campaign | Sanders suspends his campaign | Sanders suspends his campaign | Sanders suspends his campaign | Sanders suspends his campaign | Sanders suspends his campaign |
| | Mar 19, 2020 | Gabbard withdraws from the race | Gabbard withdraws from the race | Gabbard withdraws from the race | Gabbard withdraws from the race | Gabbard withdraws from the race | Gabbard withdraws from the race | Gabbard withdraws from the race | Gabbard withdraws from the race | Gabbard withdraws from the race | Gabbard withdraws from the race | Gabbard withdraws from the race |
| | Mar 1–5, 2020 | Buttigieg, Klobuchar, Bloomberg, and Warren withdraw from the race | Buttigieg, Klobuchar, Bloomberg, and Warren withdraw from the race | Buttigieg, Klobuchar, Bloomberg, and Warren withdraw from the race | Buttigieg, Klobuchar, Bloomberg, and Warren withdraw from the race | Buttigieg, Klobuchar, Bloomberg, and Warren withdraw from the race | Buttigieg, Klobuchar, Bloomberg, and Warren withdraw from the race | Buttigieg, Klobuchar, Bloomberg, and Warren withdraw from the race | Buttigieg, Klobuchar, Bloomberg, and Warren withdraw from the race | Buttigieg, Klobuchar, Bloomberg, and Warren withdraw from the race | Buttigieg, Klobuchar, Bloomberg, and Warren withdraw from the race | Buttigieg, Klobuchar, Bloomberg, and Warren withdraw from the race |
| Siena College Research Institute | Feb 16–20, 2020 | 315 (RV) | – | 13% | 21% | 9% | – | 9% | 25% | 11% | 1% | 11% |
| | Feb 3, 2020 | Iowa caucus is held | Iowa caucus is held | Iowa caucus is held | Iowa caucus is held | Iowa caucus is held | Iowa caucus is held | Iowa caucus is held | Iowa caucus is held | Iowa caucus is held | Iowa caucus is held | Iowa caucus is held |
| Civis Analytics/Data For Progress | Jan 13–19, 2020 | 845 (LV) | – | 30% | 17% | 7% | – | 2% | 17% | 14% | 15% | – |
| | Dec 3, 2019 | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race |
| Siena College | Nov 12–18, 2019 | 797 (RV) | ± 4.0% | 24% | – | 5% | 3% | 1% | 13% | 14% | 12% | 29% |
| Siena College | Oct 6–10, 2019 | 340 (RV) | ± 6.5% | 21% | – | 4% | 4% | 1% | 16% | 21% | 10% | 24% |
| | Sep 20, 2019 | de Blasio withdraws from the race | de Blasio withdraws from the race | de Blasio withdraws from the race | de Blasio withdraws from the race | de Blasio withdraws from the race | de Blasio withdraws from the race | de Blasio withdraws from the race | de Blasio withdraws from the race | de Blasio withdraws from the race | de Blasio withdraws from the race | de Blasio withdraws from the race |
| Siena College* | Sep 8–12, 2019 | 359 (RV) | ± 6.1% | 22% | – | 3% | 4% | 1% | 15% | 17% | 4% | 34% |
| | Aug 28, 2019 | Gillibrand withdraws from the race | Gillibrand withdraws from the race | Gillibrand withdraws from the race | Gillibrand withdraws from the race | Gillibrand withdraws from the race | Gillibrand withdraws from the race | Gillibrand withdraws from the race | Gillibrand withdraws from the race | Gillibrand withdraws from the race | Gillibrand withdraws from the race | Gillibrand withdraws from the race |

### Head-to-head polls

| Poll source | Date(s) administered | Sample size | Margin of error | Bill de Blasio | Kirsten Gillibrand | Other | Undecided |
| Siena College | Jun 2–6, 2019 | 385 | – | 25% | 56% | 11% | 8% |

## New Jersey primary

The New Jersey Democratic primary was scheduled to take place on June 2, 2020, but was delayed due to the COVID-19 pandemic, and is instead scheduled for July 7, 2020.
Polling aggregation :
| Source of poll aggregation | Date updated | Dates polled | Joe Biden | Bernie Sanders | Undecided |
| FiveThirtyEight | Mar 8, 2020 | until Feb 18, 2020 | 35.5% | 30.5% | 34.0% |
| Poll source | Date(s) administered | Sample size | Margin of error | Joe Biden | Michael Bloomberg | Cory Booker | Pete Buttigieg | Kamala Harris | Beto O'Rourke | Bernie Sanders | Elizabeth Warren | Other | Undecided |
| | Mar 5, 2020 | Warren withdraws from the race | Warren withdraws from the race | Warren withdraws from the race | Warren withdraws from the race | Warren withdraws from the race | Warren withdraws from the race | Warren withdraws from the race | Warren withdraws from the race | Warren withdraws from the race | Warren withdraws from the race | Warren withdraws from the race | Warren withdraws from the race |
| | Mar 4, 2020 | Bloomberg withdraws from the race | Bloomberg withdraws from the race | Bloomberg withdraws from the race | Bloomberg withdraws from the race | Bloomberg withdraws from the race | Bloomberg withdraws from the race | Bloomberg withdraws from the race | Bloomberg withdraws from the race | Bloomberg withdraws from the race | Bloomberg withdraws from the race | Bloomberg withdraws from the race | Bloomberg withdraws from the race |
| | Mar 3, 2020 | Super Tuesday | Super Tuesday | Super Tuesday | Super Tuesday | Super Tuesday | Super Tuesday | Super Tuesday | Super Tuesday | Super Tuesday | Super Tuesday | Super Tuesday | Super Tuesday |
| | Mar 2, 2020 | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race | Klobuchar withdraws from the race |
| | Mar 1, 2020 | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race |
| | Feb 29, 2020 | South Carolina primary; Steyer withdraws from the race after close of polls | South Carolina primary; Steyer withdraws from the race after close of polls | South Carolina primary; Steyer withdraws from the race after close of polls | South Carolina primary; Steyer withdraws from the race after close of polls | South Carolina primary; Steyer withdraws from the race after close of polls | South Carolina primary; Steyer withdraws from the race after close of polls | South Carolina primary; Steyer withdraws from the race after close of polls | South Carolina primary; Steyer withdraws from the race after close of polls | South Carolina primary; Steyer withdraws from the race after close of polls | South Carolina primary; Steyer withdraws from the race after close of polls | South Carolina primary; Steyer withdraws from the race after close of polls | South Carolina primary; Steyer withdraws from the race after close of polls |
| | Feb 22, 2020 | Nevada caucuses | Nevada caucuses | Nevada caucuses | Nevada caucuses | Nevada caucuses | Nevada caucuses | Nevada caucuses | Nevada caucuses | Nevada caucuses | Nevada caucuses | Nevada caucuses | Nevada caucuses |
| FDU | Feb 12–16, 2020 | 357 (RV) | – | 16% | 23% | – | 10% | – | – | 25% | 8% | 7% | 11% |
| | Feb 11, 2020 | New Hampshire primary; Yang withdraws from the race | New Hampshire primary; Yang withdraws from the race | New Hampshire primary; Yang withdraws from the race | New Hampshire primary; Yang withdraws from the race | New Hampshire primary; Yang withdraws from the race | New Hampshire primary; Yang withdraws from the race | New Hampshire primary; Yang withdraws from the race | New Hampshire primary; Yang withdraws from the race | New Hampshire primary; Yang withdraws from the race | New Hampshire primary; Yang withdraws from the race | New Hampshire primary; Yang withdraws from the race | New Hampshire primary; Yang withdraws from the race |
| | Feb 3, 2020 | Iowa caucuses | Iowa caucuses | Iowa caucuses | Iowa caucuses | Iowa caucuses | Iowa caucuses | Iowa caucuses | Iowa caucuses | Iowa caucuses | Iowa caucuses | Iowa caucuses | Iowa caucuses |
| Emerson College | Jan 16–19, 2020 | 388 | ± 4.9% | 28% | 9% | – | 6% | – | – | 25% | 15% | 16% | – |
| | Jan 13, 2020 | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race | Booker withdraws from the race |
| | Dec 3, 2019 | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race | Harris withdraws from the race |
| | Nov 24, 2019 | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy | Bloomberg announces his candidacy |
| Monmouth University | Sep 12–16, 2019 | 713 | ± 3.7% | 26% | – | 9% | 6% | 6% | 0% | 18% | 20% | 7% | 8% |
| Change Research | Aug 16–20, 2019 | 1176 | ± 2.9% | 26% | – | 5% | 12% | 8% | 2% | 21% | 23% | 3% | – |

## Connecticut primary

The Connecticut Democratic primary was scheduled to take place on April 28, 2020, but was delayed due to the COVID-19 pandemic, first to June 2, 2020, and then further delayed to August 11, 2020.
| Poll source | Date(s) administered | Sample size | Margin of error | Joe Biden | Bernie Sanders | Pete Buttigieg | Elizabeth Warren | Other | Undecided |
| | Apr 8, 2020 | Sanders suspends his campaign | Sanders suspends his campaign | Sanders suspends his campaign | Sanders suspends his campaign | Sanders suspends his campaign | Sanders suspends his campaign | Sanders suspends his campaign | Sanders suspends his campaign |
| GreatBlue Research/Sacred Heart University/Hartford Courant | Mar 24–Apr 3, 2020 | – (RV) | – | 52.0% | 32.5% | – | – | 1.4% | 14.1% |
| GreatBlue Research/Sacred Heart University/Hartford Courant | Feb 24–Mar 12, 2020 | 383 (RV) | – | 42.1% | 24.5% | – | – | 19.5% | 13.8% |
| | Mar 5, 2020 | Warren withdraws from the race | Warren withdraws from the race | Warren withdraws from the race | Warren withdraws from the race | Warren withdraws from the race | Warren withdraws from the race | Warren withdraws from the race | Warren withdraws from the race |
| | Mar 1, 2020 | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race | Buttigieg withdraws from the race |
| GreatBlue Research/Sacred Heart University/Hartford Courant | Dec 16, 2019–Jan 2, 2020 | 348 (RV) | – | 33.0% | 19.3% | 11.2% | 17.8% | 3.4% | 15.2% |