# Statewide opinion polling for the April, May, and June 2008 Democratic Party presidential primaries

This article is a collection of statewide public opinion polls that have been conducted relating to the April, May, and June Democratic presidential primaries, 2008.

## Pennsylvania

Pennsylvania winner: Hillary Clinton Format: Primary see: Pennsylvania Democratic primary, 2008 Date: April 22, 2008 Delegates at stake 188 Delegates won To be determined

### Tracking Polls

| Poll source | Date | Highlights |
| Newsmax/Zogby Tracking Latest Sample size: 675 LV Latest Margin of error: ± 3.8% | April 20–21, 2008 | Clinton 51%, Obama 41%, Someone else 3%, Not sure 6% |
| Newsmax/Zogby Tracking Latest Sample size: 675 LV Latest Margin of error: ± 3.8% | April 19–20, 2008 | Clinton 48%, Obama 42%, Someone else 4%, Not sure 6% |
| Newsmax/Zogby Tracking Latest Sample size: 675 LV Latest Margin of error: ± 3.8% | April 18–19, 2008 | Clinton 46%, Obama 43%, Someone else 3%, Not sure 8% |
| Newsmax/Zogby Tracking Latest Sample size: 675 LV Latest Margin of error: ± 3.8% | April 17–18, 2008 | Clinton 47%, Obama 42%, Someone else 3%, Not sure 8% |
| Newsmax/Zogby Tracking Latest Sample size: 675 LV Latest Margin of error: ± 3.8% | April 16–17, 2008 | Clinton 47%, Obama 43%, Someone else 2%, Not sure 8% |
| Newsmax/Zogby Tracking Latest Sample size: 675 LV Latest Margin of error: ± 3.8% | April 15–16, 2008 | Clinton 45%, Obama 44%, Someone else 3%, Not sure 9% |

### Polls

| Poll source | Date | Highlights |
| Insider Advantage/Majority Opinion Sample size: 712 LV Margin of error: ± 3.6% | April 21, 2008 | Clinton 49%, Obama 42%, Not Sure 9% |
| Newsmax/Zogby Sample size: 675 LV Margin of error: ± 4% | April 20–21, 2008 | Clinton 51%, Obama 41%, Someone else 3%, Not sure 6% |
| American Research Group Sample size: 600 Margin of error: ± 4% | April 20–21, 2008 | Clinton 56%, Obama 40%, Other 1%, Undecided 3% |
| Insider Advantage/Majority Opinion Sample size: 747 LV Margin of error: ± 3.4% | April 20, 2008 | Clinton 49%, Obama 39%, Not Sure 12% |
| Rasmussen Reports Sample size: 722 LV Margin of error: ± 4% | April 20, 2008 | Clinton 49%, Obama 44%, Not Sure 7% |
| Public Policy Polling Sample size: 2,338 LV Margin of error: ± 2% | April 19–20, 2008 | Obama 49%, Clinton 46%, Undecided 5% |
| Newsmax/Zogby Sample size: 602 LV Margin of error: ± 4.1% | April 19–20, 2008 | Clinton 48%, Obama 42%, Someone else 4%, Not sure 6% |
| Suffolk University Sample size: 600 LV Margin of error: ± 4% | April 19–20, 2008 | Clinton 52%, Obama 42%, Undecided 4%, Refused a response 2% |
| SurveyUSA Sample size: 710 LV Margin of error: ± 3.8% | April 18–20, 2008 | Clinton 50%, Obama 44%, Other 4%, Undecided 2% |
| Quinnipiac University Sample size: 1,027 LV Margin of error: ± 3.1% | April 18–20, 2008 | Clinton 51%, Obama 44%, Other 1%, Undecided 4% |
| Strategic Vision Sample size: 1,200 LV Margin of error: ± 3% | April 18–20, 2008 | Clinton 48%, Obama 41%, Undecided 11% |
| Newsmax/Zogby Sample size: 607 LV Margin of error: ± 4.1% | April 18–19, 2008 | Clinton 46%, Obama 43%, Someone else 3%, Not sure 8% |
| American Research Group Sample size: 600 Margin of error: ± 4% | April 17–19, 2008 | Clinton 54%, Obama 41%, Other 1%, Undecided 4% |
| MSNBC/McClatchy/Mason-Dixon Sample size: 625 LV Margin of error: ± 4% | April 17–18, 2008 | Clinton 48%, Obama 43%, Undecided 8% |
| Newsmax/Zogby Sample size: 608 LV Margin of error: ± 4.1% | April 17–18, 2008 | Clinton 47%, Obama 42%, Someone else 3%, Not sure 8% |
| Rasmussen Reports Sample size: 730 LV Margin of error: ± 4% | April 17, 2008 | Clinton 47%, Obama 44%, 9% Undecided |
| Newsmax/Zogby Sample size: 602 LV Margin of error: ± 4.1% | April 16–17, 2008 | Clinton 47%, Obama 43%, Someone else 2%, Not sure 8% |
| Muhlenberg College Sample size: 322 Margin of error: ±5.5% | April 10–17, 2008 | Clinton 47%, Obama 46%, Undecided 7% |
| Newsmax/Zogby Sample size: 601 LV Margin of error: ± 4.1% | April 15–16, 2008 | Clinton 45%, Obama 44%, Someone else 3%, Not sure 9% |
| Public Policy Polling Sample size: 1,095 Margin of error: ± 3% | April 14–15, 2008 | Obama 45%, Clinton 42%, Undecided 13% |
| Rasmussen Reports Sample size: 741 Margin of error: ± 4% | April 14, 2008 | Clinton 50%, Obama 41%, Undecided 9% |
| SurveyUSA Sample size: 638 Margin of error: ± 3.9% | April 12–14, 2008 | Clinton 54%, Obama 40%, Other 3%, Undecided 3% |
| Los Angeles Times/Bloomberg Sample size: 623 Margin of error: ± 4% | April 10–14, 2008 | Clinton 46%, Obama 41%, Other 1%, Undecided 12% |
| Strategic Vision Sample size: 1200 Margin of error: ± 3% | April 11–13, 2008 | Clinton 49%, Obama 40%, Other/Undecided 11% |
| American Research Group Sample size: 600 Margin of error: ± 4% | April 11–13, 2008 | Clinton 57%, Obama 37%, Other 2%, Undecided 4% |
| Quinnipiac University Sample size: 2,103 Margin of error: ± 2.1% | April 9–13, 2008 | Clinton 50%, Obama 44%, Undecided 6% |
| Franklin & Marshall College Sample size: 367 Margin of error: ±5.1% | April 8–13, 2008 | Clinton 46%, Obama 40%, Undecided 14% |
| Newsmax/Zogby Sample size: 1,002 Margin of error: ± 3.2% | April 9–10, 2008 | Clinton 47%, Obama 43%, Undecided 10% |
| Susquehanna Polling Sample Size: 500 LV Margin of Error: ± 4.3% | April 6–10, 2008 | Clinton 40%, Obama 37%, Undecided 18%, Other 4% |
| Temple University Sample size: 583 Margin of error: ± 4% | March 27 – April 9, 2008 | Clinton 47%, Obama 41%, Undecided 11% |
| InsiderAdvantage Sample size: 681 Margin of error: ± 3.6% | April 8, 2008 | Clinton 48%, Obama 38%, Undecided 13% |
| Public Policy Polling Sample size: 1,124 Margin of error: ± 2.9% | April 7–8, 2008 | Clinton 46%, Obama 43%, Undecided 11% |
| Rasmussen Reports Sample size: 695 Margin of error: ± 4% | April 7, 2008 | Clinton 48%, Obama 43%, Undecided 9% |
| SurveyUSA Sample size: 597 Margin of error: ± 4.1% | April 5–7, 2008 | Clinton 56%, Obama 38%, Other 4%, Undecided 2% |
| American Research Group Sample size: 600 Margin of error: ± 4% | April 5–6, 2008 | Clinton 45%, Obama 45%, Other 4%, Undecided 6% |
| Strategic Vision | April 4–6, 2008 | Clinton 47%, Obama 42%, Undecided 11% |
| Quinnipiac University Sample size: 1,340 Margin of error: ± 2.7% | April 3–6, 2008 | Clinton 50%, Obama 44%, Other 1%, Undecided 6% |
| Time Magazine Sample size: 676 | April 2–6, 2008 | Clinton 44%, Obama 38%, Undecided 18% |
| Insider Advantage/Majority Opinion Sample size: 659 | April 3, 2008 | Clinton 45%, Obama 42%, Undecided 12% |
| Muhlenberg College Sample size: 406 Margin of error: ±5% | March 27 – April 2, 2008 | Clinton 49%, Obama 38%, Other 2%, Undecided 11% |
| Public Policy Polling Sample size: 1,224 Margin of error: ± 2.8% | March 31 – April 1, 2008 | Obama 45%, Clinton 43%, Undecided 13% |
| Rasmussen Reports Sample size: 730 Margin of error: ± 4% | March 31, 2008 | Clinton 47%, Obama 42%, Undecided 11% |
| Quinnipiac University Sample size: 1,549 Margin of error: ± 2.5% | March 24–31, 2008 | Clinton 50%, Obama 41%, Other 1%, Undecided 8% |
| Survey USA Sample size: 588 Margin of error: ± 4,1% | March 29–31, 2008 | Clinton 53%, Obama 41%, Someone else 4%, Undecided 2% |
| Strategic Vision Sampling Size: 504 | March 28–30, 2008 | Clinton 49%, Obama 41%, Undecided 10% |
| American Research Group Sample size: 600 Margin of error: ± 4% | March 26–27, 2008 | Clinton 51%, Obama 39%, Other 2%, Undecided 8% |
| Rasmussen Reports Sample size: 690 Margin of error: ± 4% | March 24, 2008 | Clinton 49%, Obama 39%, Undecided 12% |
| Public Policy Polling Sample size: 597 Margin of error: ± 4% | March 15–16, 2008 | Clinton 56%, Obama 30%, Undecided 14% |
| Quinnipiac University Sample size: 1,304 Margin of error: ± 2.7% | March 10–16, 2008 | Clinton 53%, Obama 41%, Other 1%, Undecided 6% |
| Franklin & Marshall College Sample size: 294 Margin of error: ±5.7% | March 11–16, 2008 | Clinton 51%, Obama 35%, Other 1%, Undecided 13% |
| Rasmussen Reports Sample size: 697 Margin of error: ± 4% | March 12, 2008 | Clinton 51%, Obama 38%, Undecided 11% |
| Survey USA Sample size: 608 Margin of error: ± 4% | March 8–10, 2008 | Clinton 55%, Obama 36%, Someone else 5%, Undecided 3% |
| Susquehanna Polling Sample size: 500 | March 5–10, 2008 | Clinton 45%, Obama 31%, Someone else 4%, Undecided 20% |
| Strategic Vision Sample size: 1,200 Margin of error: ±3% | March 7–9, 2008 | Clinton 56%, Obama 38%, Undecided 6% |
| American Research Group Sample size: 600 Margin of error: ± 4% | March 7–8, 2008 | Clinton 52%, Obama 41%, Someone else 1%, Undecided 6% |
| Rasmussen Reports Sample size: 690 Margin of error: ± 4% | March 5, 2008 | Clinton 52%, Obama 37%, Undecided 11% |
| Rasmussen Reports Sample size: 820 Margin of error: ± 3% | February 26, 2008 | Clinton 46%, Obama 42%, Undecided 12% ‡ |
| Quinnipiac University Sample size: 506 LV Margin of error: ±4.4% | February 21–25, 2008 | Clinton 49%, Obama 43%, Other 1%, Undecided 7% ‡ |
| Franklin & Marshall College Sample size: 303 Margin of error: ±5.6% | February 13–18, 2008 | Clinton 44%, Obama 32%, Other 4%, Undecided 20% |
| Quinnipiac University Sample size: 577 LV Margin of error: ±4.1% | February 6–12, 2008 | Clinton 52%, Obama 36%, Other 1%, Undecided 11% |
| Franklin & Marshall College Sample size: 627 Margin of error: ±3.9% | January 8–14, 2008 | Clinton 40%, Obama 20%, Edwards 11%, Other 6%, Undecided 23% |
| Quinnipiac University Sample size: 462 Margin of error: ± 4.6% | November 23 – December 3, 2007 | Clinton 43%, Obama 15%, Edwards 9%, Biden 5%, Kucinich 3%, Richardson 2%, Dodd 1%, Gravel -, Other 2%, undecided 18% |
| Quinnipiac University | October 31 – November 5, 2007 | Clinton 48%, Obama 15%, Edwards 11%, Biden 3%, Richardson 2%, Kucinich 1%, Dodd -, Gravel -, Other 1%, undecided 15% |
| Quinnipiac University | October 1–8, 2007 | Clinton 41%, Obama 14%, Edwards 11%, Biden 5%, Richardson 3%, Kucinich 3%, Dodd -, Gravel -, Other 2%, undecided 18% |
| Strategic Vision | September 28–30, 2007 | Clinton 42%, Obama 24%, Edwards 9%, Richardson 6%, Biden 5%, Dodd 1%, Kucinich 1%, undecided 12% |
| Pennsylvania Keystone Poll | August 24 – September 2, 2007 | Clinton 38%, Obama 21%, Edwards 17%, Other 6%, Don't Know 18% |
| Quinnipiac University | 14–20 August 2007 | Clinton 42%, Gore 13%, Obama 12%, Edwards 8%, Biden 4%, Richardson 1%, Kucinich 1%, Dodd -, Gravel -, Other 2%, undecided 16% |
| Quinnipiac University | July 30–6 August 2007 | Clinton 35%, Obama 19%, Gore 12%, Edwards 10%, Biden 2%, Richardson 2%, Kucinich 1%, Dodd -, Gravel -, Other 2%, undecided 15% |
| Strategic Vision (R) | July 6–8, 2007 | Clinton 36%, Obama 25%, Edwards 12%, Richardson 8%, Biden 5%, Dodd 1%, Kucinich 1%, undecided 12% |
| Quinnipiac (without Gore) | June 22–28, 2007 | Clinton 38%, Obama 22%, Edwards 10%, Biden 6%, Richardson 2%, Dodd 1%, Kucinich 1%, Gravel -, Other 2%, undecided 15% |
| Quinnipiac (with Gore) | June 22–28, 2007 | Clinton 32%, Obama 18%, Gore 16%, Edwards 7%, Biden 5%, Richardson 2%, Dodd 1%, Kucinich 1%, Gravel -, Other 2%, undecided 15% |
| WTAE/Pittsburgh Tribune-Review Keystone | May 29 – June 4, 2007 | Clinton 40%, Edwards 21%, Obama 18%, Other 3%, Unsure 18% |
| Quinnipiac University | May 22–28, 2007 | Clinton 33%, Gore 16%, Obama 13%, Edwards 11%, Biden 3%, Richardson 3%, Kucinich 1%, Wesley Clark -, Dodd -, Gravel -, Other 4%, Unsure 16% |
| Strategic Vision (R) | 13–15 April 2007 | Clinton 33%, Obama 23%, Edwards 19%, Biden 3%, Richardson 3%, Dodd 1%, Kucinich 1%, undecided 17% |
| Quinnipiac University (without Gore) | 19–25 March 2007 | Clinton 38%, Obama 24%, Edwards 16%, Biden 6%, Richardson 3%, Clark 0%, Dodd 0%, Gravel 0%, Kucinich 0%, Other 1%, Unsure 11% |
| Quinnipiac University | 19–25 March 2007 | Clinton 36%, Obama 17%, Gore 13%, Edwards 9%, Biden 4%, Richardson 2%, Clark 0%, Dodd 0%, Gravel 0%, Kucinich 0%, Other 2%, Unsure 16% |
| Strategic Vision | 16–18 March 2007 | Clinton 35%, Obama 25%, Edwards 13%, Clark 2%, Biden 3%, Dodd 1%, Kucinich 1%, Richardson 2%, undecided 18% |
| Quinnipiac University | 1–5 February 2007 | Clinton 37%, Obama 11%, Edwards 11%, Gore 11%, Biden 5%, Dodd 1%, Kucinich 1%, Richardson 1%, Vilsack 1%, Someone Else 2%, Wouldn't Vote 2%, undecided 17% |
| American Research Group | 16–22 January 2007 | Clinton 32%, Obama 13%, Edwards 12%, Biden 8%, Clark 6%, Dodd 2%, Kerry 2%, Kucinich 2%, Gravel 1%, Richardson 1%, Vilsack 1%, undecided 21% |

## Indiana

Indiana winner: Hillary Clinton Format: Primary see: Indiana Democratic primary, 2008 Date: 6 May 2008 Delegates at stake 72 Delegates won To be determined
The sample set for some polls in this table is not unique and overlaps with polls from previous days. These polls are marked as Tracking Polls.
| Poll source | Date | Highlights |
| Zogby International Sample Size: 644 (Tracking) Margin of Error: ± 3.9% | May 4–5, 2008 | Obama 45%, Clinton 43%, Someone else 5%, Undecided 7% see Indiana Tracking Polls for earlier results |
| Insider Advantage/Majority Opinion Sample size: 502 Margin of error: ± 4% | May 4, 2008 | Clinton 48%, Obama 44%, Undecided 8% |
| Public Policy Polling Sample Size: 851 LV Margin of Error ± 3.4% | May 3–4, 2008 | Clinton 49%, Obama 44%, Undecided 7% |
| Suffolk University Sample Size: 600 LV Margin of Error ± 4% | May 3–4, 2008 | Clinton 49%, Obama 43%, Undecided 6%, No Response 2% |
| Survey USA Sample Size: 675 LV Margin of Error ± 3.8% | May 2–4, 2008 | Clinton 54%, Obama 42%, Undecided 2%, No Response 1% |
| American Research Group Sample Size: 600 LV Margin of Error ± 4% | May 2–4, 2008 | Clinton 53%, Obama 45%, Undecided 2% |
| American Research Group Sample size: 600 LV Margin of error: ± 4% | April 30 – May 1, 2008 | Clinton 53%, Obama 44%, Undecided 3% |
| Insider Advantage/Majority Opinion Sample size: 478 Margin of error: ± 4% | April 30 – May 1, 2008 | Clinton 47%, Obama 40%, Undecided 13% |
| Downs Center/SurveyUSA Sample size: 689 Margin of error: ± 3.8% | April 28–30, 2008 | Clinton 52%, Obama 45%, Undecided 5% |
| Rasmussen Reports Sample size: 400 Margin of error: ±5% | April 29, 2008 | Clinton 46%, Obama 41%, Undecided 13% |
| TeleResearch Corp Sample size: 943 Margin of error: ±3.3% | April 25–29, 2008 | Clinton 48%, Obama 38%, Undecided 14% |
| Public Policy Polling Sample size: 1,388 Margin of error: ±2.6% | April 26–27, 2008 | Clinton 50%, Obama 42%, Undecided 8% |
| SurveyUSA Sample size: 628 Margin of error: ±4% | April 25–27, 2008 | Clinton 52%, Obama 43%, Other 3%, Undecided 2% |
| Howey-Gauge Sample size: 600 LV Margin of error: ± 4.1% | April 23–24, 2008 | Obama 47%, Clinton 45%, Undecided 8% |
| American Research Group Sample size: 600 LV Margin of error: ± 4% | April 23–24, 2008 | Clinton 50%, Obama 45%, Undecided 5% |
| Research 2000/South Bend Tribune Sample size: 400 LV Margin of error: ± 5% | April 23–24, 2008 | Obama 48%, Clinton 47%, Undecided 2% |
| Selzer & Co./Indianapolis Star/WTHR Sample size: 534 LV Margin of error: ± 4.2% | April 20–23, 2008 | Obama 41%, Clinton 38%, Undecided 21% |
| Downs Center/SurveyUSA Sample size: 578 Margin of error: ±4.2% | April 14–16, 2008 | Obama 50%, Clinton 45%, Undecided 5% |
| Los Angeles Times/Bloomberg Sample size: 687 Margin of error: ±4% | April 10–14, 2008 | Obama 40%, Clinton 35%, Other 6%, Unsure 19% |
| SurveyUSA Sample size: 571 Margin of error: ±4.2% | April 11–13, 2008 | Clinton 55%, Obama 39%, Other 3%, Undecided 3% |
| American Research Group Sample size: 600 LV Margin of error: ±4% | April 2–3, 2008 | Clinton 53%, Obama 44%, Other 1%, Undecided 2% |
| Research 2000 Sample size: 400 Margin of error: ±5% | March 31 – April 2, 2008 | Clinton 49%, Obama 46%, Other 3%, Undecided 2% |
| Survey USA Sample size: 530 Margin of error: ±4.3% | March 29–31, 2008 | Clinton 52%, Obama 43%, Other 4%, Undecided 1% |
| Howey-Gauge Sample size: 500 Margin of error: ±4.5% | February 18–21, 2008 | Obama 40%, Clinton 25%, Unsure 35% |

### Indiana Tracking polls

| Poll source | Date | Highlights |
| Zogby International | May 4–5, 2008 Sample Size: 644 Margin of Error: ±3.9% | Obama 45%, Clinton 43%, Someone else 5%, Undecided 7% |
| Zogby International | May 3–4, 2008 Sample Size: 636 Margin of Error: ± 4% | Obama 44%, Clinton 42%, Someone else 7%, Undecided 8% |
| Zogby International | May 2–3, 2008 Sample Size: 595 Margin of Error: ± 4.1% | Obama 43%, Clinton 41%, Someone else 8%, Undecided 8% |
| Zogby International | May 1–2, 2008 Sample Size: 629 Margin of Error: ± 4% | Obama 43%, Clinton 42%, Someone else 7%, Undecided 8% |
| Zogby International | April 30 – May 1, 2008 Sample Size: 680 Margin of Error: ±3.8% | Clinton 42%, Obama 42%, Someone else 7%, Undecided 9% |

## North Carolina

: Barack Obama Format: Primary see: North Carolina Democratic primary, 2008 Date: 6 May 2008 Delegates at stake 115 Delegates won To be determined
The sample set for some polls in this table is not unique and overlaps with polls from previous days. These polls are marked as Tracking Polls.
| Poll source | Date | Highlights |
| Insider Advantage/Majority Opinion Sample size: 774 LV Margin of error: ± 3% | May 5, 2008 | Obama 47%, Clinton 43%, Undecided 10% |
| Zogby International Sample Size: 643 LV(Tracking) Margin of error: ± 3.9% | May 4–5, 2008 | Obama 51%, Clinton 37%, Someone else 4%, Undecided 8% see North Carolina Tracking Polls for earlier results |
| Insider Advantage/Majority Opinion Sample size: 781 LV Margin of error: ± 3% | May 4, 2008 | Obama 48%, Clinton 45%, Undecided 7% |
| Public Policy Polling Sample size: 870 LV Margin of error: ± 3.3% | May 3–4, 2008 | Obama 52%, Clinton 42%, Undecided 7% |
| Survey USA Sample size: 810 LV Margin of error: ± 3.5% | May 2–4, 2008 | Obama 50%, Clinton 45%, Someone else 3%, Undecided 2% |
| American Research Group Sample size: 600 LV Margin of error: ± 4% | May 2–4, 2008 | Obama 50%, Clinton 42%, Someone else 4%, Undecided 4% |
| Rasmussen Reports Sample size: 831 Margin of error: ±4 | May 1, 2008 | Obama 49%, Clinton 40%, Undecided 11% |
| Insider Advantage/Majority Opinion Sample size: 611 Margin of error: ±3.8% | May 1, 2008 | Obama 49%, Clinton 44%, Undecided 7% |
| American Research Group Sample size: 600 Margin of error: ±4% | April 30 – May 1, 2008 | Obama 52%, Clinton 41%, Someone else 2%, Undecided 5% |
| Research 2000 Sample size: 500 Margin of error: ± 4.5% | April 29–30, 2008 | Obama 51%, Clinton 44%, Other 2%, Undecided 3% |
| Insider Advantage/Majority Opinion Sample size: 571 Margin of error: ±3.8 | April 29, 2008 | Clinton 44%, Obama 42%, Undecided 14% |
| Mason Dixon/WRAL Sample size: 400 Margin of error: ±5% | April 28–29, 2008 | Obama 49%, Clinton 42%, Other/Undecided 9% |
| Rasmussen Reports Sample size: 774 Margin of error: ±4 | April 28, 2008 | Obama 51%, Clinton 37%, Undecided 12% |
| Survey USA Sample size: 727 Margin of error: ±3.7% | April 26–28, 2008 | Obama 49%, Clinton 44%, Other 4%, Undecided 3% |
| Public Policy Polling Sample size: 1,121 Margin of error: ±2.9% | April 26–27, 2008 | Obama 51%, Clinton 39%, Undecided 10% |
| American Research Group Sample size: 600 Margin of error: ±4 | April 26–27, 2008 | Obama 52%, Clinton 42%, Someone else 2%, Undecided 4% |
| Survey USA Sample size: 734 Margin of error: ±3.7% | April 19–21, 2008 | Obama 50%, Clinton 41%, Other 5%, Undecided 5% |
| Public Policy Polling Sample size: 962 Margin of error: ±3.2% | April 19–20, 2008 | Obama 57%, Clinton 32%, Undecided 11% |
| American Research Group Sample size: 600 Margin of error: ±4 | April 14–15, 2008 | Obama 52%, Clinton 41%, Someone else 2%, Undecided 5% |
| Insider Advantage/Majority Opinion Sample size: 541 Margin of error: ±4% | April 14, 2008 | Obama 51%, Clinton 36%, Undecided 13% |
| Los Angeles Times/Bloomberg Sample size: 691 Margin of error: ±4% | April 10–14, 2008 | Obama 47%, Clinton 34%, Other 2%, Undecided 17% |
| Public Policy Polling Sample size: 538 Margin of error: ±4.2% | April 12–13, 2008 | Obama 54%, Clinton 34%, Undecided 13% |
| Citivas Institute/TelOpinion Research Sample size: 800 Margin of error: ±3.7% | April 9–10, 2008 | Obama 45%, Clinton 27%, Undecided 28% |
| Survey USA Sample size: 725 Margin of error: ±3.7% | April 5–7, 2008 | Obama 49%, Clinton 39%, Other 7%, Undecided 5% |
| Public Policy Polling Sample size: 928 Margin of error: ±3.2% | April 5–6, 2008 | Obama 54%, Clinton 33%, Undecided 13% |
| Rasmussen Reports Sample size: 704 Margin of error: ±4% | April 3, 2008 | Obama 56%, Clinton 33%, Undecided 11% |
| Charlotte Observer Sample size: 400 | March 29 – April 1, 2008 | Obama 35%, Clinton 26%, Undecided 39% |
| Public Policy Polling Sample size: 1,100 Margin of error: ± 3% | March 29–30, 2008 | Obama 54%, Clinton 36%, Undecided 9% |
| American Research Group Sample size: 600 Margin of error: ±4% | March 29–30, 2008 | Obama 51%, Clinton 38%, Other 4%, Undecided 7% |
| Insider Advantage/Majority Opinion Sample size: 460 | March 27, 2008 | Obama 49%, Clinton 34%, Undecided 17% |
| Public Policy Polling Sample size: 673 Margin of error: ±3.8% | March 24, 2008 | Obama 55%, Clinton 34%, Undecided 11% |
| Public Policy Polling Sample size: 521 Margin of error: ±4.3% | March 17, 2008 | Obama 44%, Clinton 43%, Undecided 13% |
| Survey USA Sample size: 713 Margin of error: ±3.7% | March 8–10, 2008 | Obama 49%, Clinton 41%, Other 6%, Undecided 4% |
| Rasmussen Reports Sample size: 716 Margin of error: ±4% | March 6, 2008 | Obama 47%, Clinton 40%, Undecided 14% |
| Public Policy Polling Sample size: 508 LV Margin of error: ±4.3% | March 3, 2008 | Obama 47%, Clinton 43%, Undecided 10% |
| Civitas Institute/Tel Opinion Research (R) Sample size: 800 Margin of error: ±5.7% | February 19–22, 2008 | Obama 38%, Clinton 24%, Undecided 38% |
| Elon University Sample size: 307 Margin of error: ±5.7% | February 18–21, 2008 | Obama 45%, Clinton 31%, Undecided 22% |
| SurveyUSA Sample size: 580 Margin of error: ± 4.2% | February 11, 2008 | Obama 50%, Clinton 40%, Other 5%, Undecided 4% |
| Public Policy Polling (D) Sample size: 676 Margin of error: ± 3.7% | December 3, 2007 | Clinton 31%, Edwards 26%, Obama 24%, Other 12%, undecided 8% |
| SurveyUSA | November 2–5, 2007 | Clinton 43%, Edwards 25%, Obama 19%, Other 9%, undecided 5% |
| Public Policy Polling (D) | November 5, 2007 | Edwards 30%, Clinton 30%, Obama 21%, Other 12%, undecided 8% |
| Civitas Institute | October 9–14, 2007 | Clinton 31%, Obama 18%, Edwards 18%, Other 13%, undecided 19% |
| Public Policy Polling (D) | October 3, 2007 | Clinton 32%, Edwards 31%, Obama 20%, Other 10%, undecided 7% |
| Elon University Polling | September 24–27, 2007 | Clinton 37.4%, Edwards 18.0%, Obama 17.7% Biden 3.7%, Richardson 1.3%, Kucinich 0.5%, Other 0.4%, undecided 21.1% |
| Public Policy Polling (D) | September 5, 2007 | Clinton 30%, Edwards 28%, Obama 21%, Other 12%, undecided 10% |
| Public Policy Polling (D) | August 1–2, 2007 | Clinton 29%, Edwards 29%, Obama 23% Other 10%, undecided 8% |
| Public Policy Polling (D) | July 2, 2007 | Clinton 27%, Obama 27%, Edwards 26%, Other 10%, undecided 11% |
| Civitas Institute | June, 2007 | Edwards 25%, Clinton 20%, Obama 18%, Other 12%, undecided 25% |
| Public Policy Polling (D) | June 4, 2007 | Edwards 30%, Clinton 26%, Obama 22%, Other 11%, undecided 11% |
| Public Policy Polling (D) | May 1–3, 2007 | Edwards 33%, Clinton 27%, Obama 20%, Other 10%, undecided 10% |
| Public Policy Polling (D) | April 2, 2007 | Edwards 39%, Clinton 25%, Obama 20%, Other 8%, undecided 9% |
| Public Policy Polling (D) | 5 March 2007 | Edwards 29%, Obama 25%, Clinton 21%, Other 13%, undecided 12% |
| American Research Group | 4–7 January 2007 | Edwards 30%, Clinton 26%, Obama 19%, Kucinich 3%, Dodd 2%, Richardson 2%, Biden 1%, Kerry 1%, undecided 15% |

### North Carolina Tracking polls

| Poll source | Date | Highlights |
| Zogby Tracking | May 4–5, 2008 Sample Size: 643 LV Margin of error: ± 3.9% | Obama 51%, Clinton 37%, Someone else 4%, Undecided 8% |
| Zogby Tracking | May 3–4, 2008 Sample Size: 624 Margin of Error: ± 4% | Obama 48%, Clinton 40%, Someone else 5%, Undecided 8% |
| Zogby Tracking | May 2–3, 2008 Sample Size: 600 Margin of Error: ± 4.1% | Obama 48%, Clinton 39%, Someone else 5%, Undecided 8% |
| Zogby Tracking | May 1–2, 2008 Sample Size: 627 Margin of Error: ± 4% | Obama 46%, Clinton 37%, Someone else 8%, Undecided 9% |
| Zogby Tracking | April 30 – May 1, 2008 Sample Size: 668 Margin of Error: ±3.9% | Obama 50%, Clinton 34%, Someone else 8%, Undecided 8% |

## West Virginia

West Virginia winner: Hillary Clinton Format: Primary see: West Virginia Democratic primary, 2008 Date: May 13, 2008 Delegates at stake 28 Delegates won To be determined
| Poll source | Date | Highlights |
| Suffolk University Sampling Size: 600 Margin of error: ± 4% | May 10–11, 2008 | Clinton 60%, Obama 24%, Other 6%, Undecided 10% |
| American Research Group Sampling Size: 600 Margin of error: ± 4% | May 7–8, 2008 | Clinton 66%, Obama 23%, Other 5%, Undecided 6% |
| Rasmussen Reports Sampling Size: 840 Margin of error: ± 3.5% | May 4, 2008 | Clinton 56%, Obama 27%, Undecided 17% |
| TSG Consulting/Orion Strategies Sampling Size: 300 Margin of error: ± 6% | May 3, 2008 | Clinton 63%, Obama 23%, Undecided 14% |
| Rasmussen Reports Sampling Size: 702 Margin of error: ±4% | March 13, 2008 | Clinton 55%, Obama 27%, Undecided 18% |
| Charleston Daily Mail | February 26, 2008 | Clinton 43%, Obama 22%, Undecided 35% |
| American Research Group | March 29 – April 2, 2007 | Clinton 37%, Obama 22%, Edwards 19%, Biden 3%, Clark 2%, Kucinich 2%, Richardson 2%, Dodd 1%, Gravel 0%, undecided 13% |

## Kentucky

Kentucky winner: Hillary Clinton Format: Primary see: Kentucky Democratic primary, 2008 Date: 20 May 2008 Delegates at stake 51 Delegates won To be determined
| Poll source | Date | Highlights |
| Suffolk Sample size: 600 Margin of error: ± 4% | May 17–18, 2008 | Clinton 51%, Obama 25%, Edwards 6%, Uncommitted 5%, Undecided 11% |
| Survey USA Sample size: 629 Margin of error: ± 3.9% | May 16–18, 2008 | Clinton 62%, Obama 31%, Other 5%, Undecided 1% |
| American Research Group Sample size: 600 Margin of error: ± 4% | May 14–15, 2008 | Clinton 65%, Obama 29%, Other 4%, Unsure 2% |
| Survey USA Sample size: 641 Margin of error: ± 3.8% | May 9–11, 2008 | Clinton 62%, Obama 30%, Other 6%, Unsure 3% |
| Mason Dixon/Lexington Herald-Leader/WKYT Sample size: 500 Margin of error: ± 4.5% | May 7–9, 2008 | Clinton 58%, Obama 31%, Unsure 11% |
| Rasmussen Reports Sample size: 800 Margin of error: ±4% | May 5, 2008 | Clinton 56%, Obama 31%, Unsure 13% |
| Survey USA Sample size: 595 Margin of error: ±4% | May 3–5, 2008 | Clinton 62%, Obama 28%, Other 8%, Unsure 2% |
| Survey USA Sample size: 555 Margin of error: ±4.1% | April 26–28, 2008 | Clinton 63%, Obama 27%, Other 7%, Unsure 3% |
| Survey USA Sample size: 557 Margin of error: ±4.1% | April 12–14, 2008 | Clinton 62%, Obama 26%, Other 9%, Unsure 4% |
| Survey USA Sample size: 572 Margin of error: ±4.1% | March 28–30, 2008 | Clinton 58%, Obama 29%, Other 10%, Unsure 4% |

## Oregon

Oregon winner: Barack Obama Format: Mail-only Primary see: Oregon Democratic primary, 2008 Dates: May 2–20, 2008 Delegates at stake 52 Delegates won To be determined
| Poll source | Date | Highlights |
| Public Policy Polling Sampling Size: 1,296 Margin of error: ± 2.7% | May 17–18, 2008 | Obama 56%, Clinton 38%, Undecided 7% |
| Suffolk Sample size: 600 Margin of error: ± 4% | May 17–18, 2008 | Obama 45%, Clinton 41%, Undecided 8%, Refused 6% |
| Survey USA Sampling Size: 627 Margin of error: ± 4% | May 16–18, 2008 | Obama 55%, Clinton 42%, Other 2%, Undecided 1% |
| American Research Group Sample size: 600 Margin of error: ± 4% | May 14–15, 2008 | Obama 50%, Clinton 45%, Undecided 5% |
| Public Policy Polling Sampling Size: 949 Margin of error: ± 3.2% | May 10–11, 2008 | Obama 53%, Clinton 39%, Undecided 7% |
| Survey USA Sampling Size: 615 Margin of error: ± 4% | May 9–11, 2008 | Obama 54%, Clinton 43%, Other 2%, Undecided 2% |
| Davis, Hibbitts and Midghall/Portland Tribune Sampling Size: 400 Margin of error: ± 4.8% | May 8–10, 2008 | Obama 55%, Clinton 35%, Other/Undecided 10% |
| Rasmussen Reports Sampling Size: 867 Margin of error: ± 3% | May 1, 2008 | Obama 51%, Clinton 39%, Undecided 10% |
| Survey USA Sampling Size: 650 Margin of error: ± 3.9% | April 28–30, 2008 | Obama 50%, Clinton 44%, other 2%, undecided 4% |
| Survey USA Sampling Size: 597 Margin of error: ± 4.1% | April 4–6, 2008 | Obama 52%, Clinton 42%, other 4%, undecided 3% |
| Riley Research Poll Sampling Size: 427 Margin of error: ± 4.74% | January 21–29, 2008 | Clinton 36%, Obama 28%, Edwards 14%, other 4%, undecided 13% |
| Riley Research Poll | August 10–15, 2007 | Clinton 26%, Obama 18%, Edwards 17%, Kucinich 2%, Biden 2% |
| Riley Research Poll | March 5–13, 2007 | Clinton 31%, Obama 21%, Edwards 8%, Gore 4%, Richardson 2% |

## Puerto Rico

Puerto Rico winner: Hillary Clinton Format: Primary see: Puerto Rico Democratic primary, 2008 Date: June 1, 2008 Delegates at stake 55 Delegates won To be determined
| Poll source | Date | Highlights |
| Vocero/Univision Puerto Rico Sample size: 300LV Margin of error: ± 3.4% | May 8–20, 2008 | Clinton 59%, Obama 40%, Undecided 1% |
| El Vocero/Univision/ Greenberg, Quinlan, Rosner Sample size: 800 Margin of error: ± 3.4% | May 8–20, 2008 | Clinton 51%, Obama 38%, Undecided 11% |
| Research & Research Sample size: 800 Margin of error: ± 4.4% | March 31 – April 5, 2008 | Clinton 50%, Obama 37%, Undecided 13% |

## South Dakota

South Dakota winner: Hillary Clinton Format: Primary see: South Dakota Democratic primary, 2008 Date: June 3, 2008 Delegates at stake 15 Delegates won To be determined
| Poll source | Date | Highlights |
| American Research Group Sample size: 600 Margin of error: ±4% | May 31 – June 1, 2008 | Clinton 60%, Obama 34%, Undecided 6% |
| Dakota Wesleyan University Sample size:527 Margin of error: ±4% | April 3, 2008 | Obama 46%, Clinton 34%, Undecided 10%, No One 6%, Other 4% |

## Montana

Montana winner: Barack Obama Format: Primary see: Montana Democratic primary, 2008 Date: June 3, 2008 Delegates at stake 16 Delegates won To be determined
| Poll source | Date | Highlights |
| American Research Group Sample size: 600 Margin of error: ± 4% | May 31 – June 1, 2008 | Obama 48%, Clinton 44%, Undecided 8% |
| Mason-Dixon Sample size: 625 Margin of error: ± 5% | May 19–21, 2008 | Obama 52%, Clinton 35%, Undecided 13% |
| Mason-Dixon | December 17–19, 2007 | Clinton 29%, Edwards 19%, Obama 17% |