# Statewide opinion polling for the 2008 United States presidential election

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| ← 2004 | 2008 | 2012 → |
vte :
Statewide public opinion polls that were conducted relating to the 2008 United States presidential election are as follows.
* Democratic nominee Barack Obama
* Republican nominee John McCain
* Democratic vice presidential nominee Joe Biden
* Republican vice presidential nominee Sarah Palin

## Opinion polling
### Alabama

9 electoral votes (Republican in 2000 & 2004)
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Margin | Sample size | Margin of error |
| Polimetrix/YouGov | October 18–November 1 | 39% | 57% | 18 | 452 RV | Not reported |
| WKRG-TV Mobile-Pensacola/SurveyUSA | October 27–28 | 36% | 61% | 25 | 650 LV | ±3.7% |
| Alabama Education Association/Capital Survey Research Center | October 15–16 | 34% | 54% | 20 | 606 LV | ±4% |
| WKRG-TV Mobile-Pensacola/SurveyUSA | October 8–9 | 35% | 62% | 27 | 697 LV | ±3.7% |
| Alabama Education Association/Capital Survey Research Center | October 2–7 | 35% | 55% | 20 | 554 LV | ±4% |
| Rasmussen Reports/Pulse Opinion Research | September 22 | 39% | 60% | 21 | 500 LV | ±4% |
| WKRG-TV Mobile-Pensacola/SurveyUSA | September 16–17 | 34% | 64% | 30 | 655 LV | ±3.8% |
| American Research Group | September 13–16 | 36% | 58% | 22 | 600 LV | ±4% |
| Press Register/University of South Alabama | September 8–15 | 25% | 52% | 27 | 406 LV | ±5% |
| Alabama Education Association/Capital Survey Research Center | September 3–4, 8–9 | 35% | 54.8% | 19.8 | 606 LV | ±4% |
| Rasmussen Reports/Pulse Opinion Research | July 31 | 37% | 55% | 18 | 500 LV | ±4% |
| Alabama Education Association/Capital Survey Research Center | July 29–31 | 34% | 47% | 13 | 571 LV | ±4.1% |
| Alabama Education Association/Capital Survey Research Center | June 25–July 1 | 36.4% | 48.8% | 12.4 | 536 LV | ±4.3% |
| Rasmussen Reports/Pulse Opinion Research | June 26 | 36% | 51% | 15 | 500 LV | ±4% |
| Alabama Education Association/Capital Survey Research Center | May 15–June 2 | 33% | 57% | 24 | 607 LV | Not reported |
| Rasmussen Reports/Pulse Opinion Research | May 27 | 32% | 60% | 28 | 500 LV | ±4% |
| Alabama Education Association/Capital Survey Research Center | April 16–24 | 36.2% | 55.3% | 19.1 | 887 RV | ±3.1% |
| WKRG-TV Mobile-Pensacola/SurveyUSA | April 11–13 | 32% | 64% | 32 | 540 RV | ±4.1% |
| Rasmussen Reports/Pulse Opinion Research | April 2 | 37% | 55% | 18 | 500 LV | ±4.5% |
| Press Register/University of South Alabama | March 24–27 | 30% | 57% | 27 | 413 LV | Not reported |
| WKRG-TV Mobile-Pensacola/SurveyUSA | March 14–16 | 35% | 62% | 27 | 544 RV | ±4.2% |
| SurveyUSA | February 16–28 | 40% | 54% | 14 | 601 RV | ±4.1% |
| WKRG-TV Mobile-Pensacola/SurveyUSA | February 15–17 | 34% | 58% | 24 | 554 RV | ±4.2% |
| WKRG-TV Mobile-Pensacola/SurveyUSA | December 13–15, 2007 | 36% | 54% | 18 | 544 RV | ±4.3% |
| WKRG-TV Mobile-Pensacola/SurveyUSA | November 9–11, 2007 | 35% | 56% | 21 | 532 RV | ±4.3% |
| WKRG-TV Mobile-Pensacola/SurveyUSA | March 12, 2007 | 36% | 55% | 19 | Not reported | Not reported |
| WKRG-TV Mobile-Pensacola/SurveyUSA | February 12, 2007 | 32% | 61% | 29 | Not reported | Not reported |
| WKRG-TV Mobile-Pensacola/SurveyUSA | January 15, 2007 | 36% | 53% | 17 | Not reported | Not reported |
Four-way race
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Bob Barr | Ralph Nader | Margin | Sample size | Margin of error |
| Zogby Interactive | June 11–30 | 36% | 47% | 4% | <1% | 11 | 481 LV | ±4.6% |

### Alaska

3 electoral votes (Republican in 2000 & 2004)
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Margin | Sample size | Margin of error |
| American Research Group | November 1– 3 | 43% | 55% | 12 | 600 LV | ±4% |
| Hays Research Group | November 2 | 44.6% | 49.3% | 4.7 | 400 A | ±4.9% |
| Polimetrix/YouGov | October 18–November 1 | 38% | 55% | 17 | 358 LV | Not reported |
| Dittman Research | October 27–29 | 37% | 56% | 19 | 489 LV | Not reported |
| Rasmussen Reports/Pulse Opinion Research | October 28 | 41% | 57% | 16 | 500 LV | ±4.5% |
| The Anchorage Press/The Frontiersman/KENI 650 AM/KTUU Channel 2/Ivan Moore Research | October 17–19 | 42% | 53% | 11 | 500 LV | ±4.4% |
| Rasmussen Reports/Pulse Opinion Research | October 6 | 40% | 55% | 15 | 500 LV | Not reported |
| The Anchorage Press/The Frontiersman/KENI 650 AM/KTUU Channel 2/Ivan Moore Research | October 3–6 | 38% | 55% | 17 | 500 LV | Not reported |
| Fairleigh Dickinson University (PublicMind) | September 17–21 | 37% | 55% | 18 | 601 LV | ±4% |
| American Research Group | September 9–11 | 36% | 60% | 24 | 600 LV | ±4% |
| Rasmussen Reports/Pulse Opinion Research | September 9 | 33% | 64% | 31 | 500 LV | ±4.5% |
| The Anchorage Press/The Frontiersman/KENI 650AM/KTUU Channel 2/Ivan Moore Research | August 30–September 2 | 34.9% | 53.5% | 18.6 | 500 LV | Not reported |
| American Viewpoint (R) | August 30–September 2 | 33% | 57% | 24 | 400 RV | Not reported |
| Rasmussen Reports/Pulse Opinion Research | July 30 | 42% | 48% | 6 | 500 LV | ±4.5% |
| Ivan Moore Research | July 18–22, 2008 | 44.3% | 46.7% | 2.4 | 504 LV | Not reported |
| Rasmussen Reports/Pulse Opinion Research | July 17 | 44% | 49% | 5 | 500 LV | ±4.5% |
| Rasmussen Reports/Pulse Opinion Research | June 16 | 41% | 45% | 4 | 500 LV | ±4% |
| Rasmussen Reports/Pulse Opinion Research | May 14 | 41% | 50% | 9 | 500 LV | ±4% |
| | April 7 | 43% | 48% | 5 | 500 LV | ±4.5% |
| SurveyUSA | February 26–29 | 43% | 48% | 5 | 617 RV | ±4% |
Three-way race
| Poll source | Date administered (2008) | Barack Obama | John McCain | Bob Barr | Ralph Nader | Margin | Sample size | Margin of error |
| International Brotherhood of Electrical Workers Local 1457/Hays Research Group (D) | August 6–7 | 45% | 40% | N/A | 2% | 5 | 400 A | ±4.9% |
| Democratic Senatorial Campaign Committee/Global Strategy Group (D) | June 5–10 | 42% | 44% | 3% | N/A | 2 | 600 LV | Not reported |

### Arizona

10 electoral votes (Republican in 2000 & 2004)
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Margin | Sample size | Margin of error |
| Polimetrix/YouGov | October 18–November 1 | 46% | 50% | 4 | 682 RV | Not reported |
| American Research Group | October 28–30 | 46% | 50% | 4 | 600 LV | ±4% |
| NBC News/Mason-Dixon Polling & Research | October 27–28 | 44% | 48% | 4 | 600 LV | ±4% |
| CNN/Time/Opinion Research Corporation | October 23–28 | 46% | 53% | 7 | 897 LV | ±3.5% |
| Project New West/Myers Research/Myers Research/Grove Research (D) | October 23–25 | 44% | 48% | 4 | 600 LV | ±4% |
| University of Washington/Northern Arizona University | October 18–27 | 41% | 49% | 8 | 600 RV | ±4.0% |
| Channel Eight/KAET-TV/Arizona State University | October 23–26 | 44% | 46% | 2 | 1,019 RV | ±3.0% |
| Rasmussen Reports/Pulse Opinion Research | October 26 | 46% | 51% | 5 | 500 LV | ±4.5% |
| Zimmerman & Associates | October 16–19 | 41.5% | 43.5% | 2 | 408 LV | ±4.9% |
| Rasmussen Reports/Pulse Opinion Research | September 29 | 38% | 59% | 21 | 500 LV | ±4.5% |
| Channel Eight/KAET-TV/Arizona State University | September 26–28 | 38% | 45% | 7 | 975 RV | ±3.1% |
| Project New West/Myers Research/Myers Research/Grove Research (D) | September 14–16 | 40% | 54% | 14 | 600 LV | ±4% |
| American Research Group | September 11–14 | 39% | 57% | 18 | 600 LV | ±4% |
| Las Vegas Review-Journal/Mason-Dixon Polling & Research | August 13–15 | 41% | 47% | 6 | 400 LV | ±5% |
| Public Policy Polling | July 30–31 | 40% | 52% | 12 | 1,000 LV | ±3% |
| Rasmussen Reports/Pulse Opinion Research | July 30 | 38% | 57% | 19 | 500 LV | ±4.5% |
| Rasmussen Reports/Pulse Opinion Research | June 25 | 40% | 49% | 9 | 500 LV | ±4.5% |
| Channel Eight/KAET-TV/Arizona State University | June 20–21 | 28% | 38% | 10 | 350 RV | ±5.2% |
| Behavior Research Center (Rocky Mountain Poll) | May 12–20 | 39% | 50% | 11 | 630 RV | ±4% |
| Channel Eight/KAET-TV/Arizona State University | April 24–27 | 38% | 47% | 9 | 577 RV | ±4% |
| Rasmussen Reports/Pulse Opinion Research | April 15 | 37% | 57% | 20 | 500 LV | ±4.5% |
| Northern Arizona University | March 30–April 8 | 33% | 55% | 22 | 369 LV | ±5% |
| SurveyUSA | February 26–28 | 39% | 51% | 12 | 613 RV | ±4% |
| Channel Eight/KAET-TV/Arizona State University | February 21–24 | 38% | 49% | 11 | 552 RV | ±4.1% |
| Rasmussen Reports/Pulse Opinion Research | November 28, 2007 | 33% | 55% | 22 | 500 LV | ±4.5% |
| Rasmussen Reports/Pulse Opinion Research | October 3, 2007 | 36% | 50% | 14 | 500 LV | Not reported |
| Channel Eight/KAET-TV/Arizona State University | August 23–26, 2007 | 34% | 48% | 14 | 738 RV | ±3.6% |
| Behavior Research Center (Rocky Mountain Poll) | May 24–29, 2007 | 37% | 51% | 14 | 628 RV | ±3.9% |
| Northern Arizona University | April 13–19, 2007 | 39% | 54% | 15 | 493 RV | Not reported |
| Behavior Research Center (Rocky Mountain Poll) | March 10–21, 2007 | 32% | 57% | 25 | 600 RV | ±3.9% |
| Behavior Research Center (Rocky Mountain Poll) | February 12–22, 2007 | 33% | 56% | 23 | 629 RV | ±3.9% |
Four-way race
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Bob Barr | Ralph Nader | Margin | Sample size | Margin of error |
| Channel Eight/KAET-TV/Arizona State University | August 14–16 | 30% | 40% | <1% | 2 | 10 | 402 RV | ±4.9% |
| Zogby Interactive | June 11–30 | 42% | 39% | 7% | 2% | 3 | 1,142 LV | ±3.0% |

### Arkansas

6 electoral votes (Republican in 2000 & 2004)
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Margin | Sample size | Margin of error |
| Polimetrix/YouGov | October 18–November 1 | 41% | 53% | 12 | 491 RV | Not reported |
| American Research Group | October 28–31 | 44% | 51% | 7 | 600 LV | ±4% |
| Rasmussen Reports/Pulse Opinion Research | October 27 | 44% | 54% | 10 | 500 LV | ±4.5% |
| University of Arkansas | October 1–22 | 36% | 51% | 15 | 1,441 RV | ±2.5% |
| Rasmussen Reports/Pulse Opinion Research | September 22 | 42% | 51% | 9 | 500 LV | ±4.5% |
| American Research Group | September 19–22 | 41% | 53% | 12 | 600 LV | ±4% |
| Rasmussen Reports/Pulse Opinion Research| | July 17 | 39% | 52% | 13 | 500 LV | ±4.5% |
| | June 12 | 39% | 48% | 9 | 500 LV | ±4.5% |
| Rasmussen Reports/Pulse Opinion Research | May 12 | 33% | 57% | 24 | 500 LV | ±4.5% |
| Rasmussen Reports/Pulse Opinion Research | March 18 | 30% | 59% | 29 | 500 LV | ±4.5% |
| University of Central Arkansas/Opinion Research Associates | March 6–11 | 27% | 43% | 16 | 500 RV | ±4.5% |
| SurveyUSA | February 26–28 | 33% | 53% | 20 | 586 RV | ±4.1% |
Four-way race
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Bob Barr | Ralph Nader | Margin | Sample size | Margin of error |
| Zogby Interactive | June 11–30 | 41% | 39% | 4% | 1% | 2 | 461 LV | ±4.7% |

### California

55 electoral votes (Democrat in 2000 & 2004)
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Margin | Sample size | Margin of error |
| Polimetrix/YouGov | October 18–November 1 | 55% | 40% | 15 | 999 RV | Not reported |
| KABC-TV Los Angeles/KFSN-TV Fresno/KGTV-TV San Diego/KPIX-TV San Francisco/SurveyUSA | October 29–31 | 60% | 36% | 24 | 637 LV | ±3.9% |
| Field Research Corporation (Field Poll) | October 18–28 | 55% | 33% | 22 | 966 LV | ±3.3% |
| Rasmussen Reports/Pulse Opinion Research | October 25 | 61% | 34% | 27 | 500 LV | ±4.5% |
| Public Policy Institute of California | October 12–19 | 56% | 33% | 23 | 1,186 LV | ±3% |
| KABC-TV Los Angeles/KFSN-TV Fresno/KGTV-TV San Diego/KPIX-TV San Francisco/SurveyUSA | October 15–16 | 59% | 35% | 24 | 615 LV | ±4% |
| Rasmussen Reports/Pulse Opinion Research | October 9 | 56% | 40% | 16 | 500 LV | ±4.5% |
| KABC-TV Los Angeles/KFSN-TV Fresno/KGTV-TV San Diego/KPIX-TV San Francisco/SurveyUSA | October 4–5 | 55% | 39% | 16 | 670 LV | ±3.8% |
| KABC-TV Los Angeles/KFSN-TV Fresno/KGTV-TV San Diego/KPIX-TV San Francisco/SurveyUSA | September 23–25 | 53% | 43% | 10 | 661 LV | ±3.9% |
| Rasmussen Reports/Pulse Opinion Research | September 22 | 56% | 39% | 17 | 500 LV | ±4.5% |
| American Research Group | September 18–20 | 53% | 39% | 14 | 600 LV | ±4% |
| Public Policy Institute of California | September 9–16 | 50% | 40% | 10 | 1,157 LV | ±3% |
| Field Research Corporation (Field Poll) | September 5–14 | 52% | 36% | 16 | 830 LV | ±3.5% |
| Rasmussen Reports/Pulse Opinion Research | August 21 | 54% | 41% | 13 | 500 LV | ±4.5% |
| Public Policy Institute of California | August 12–19 | 48% | 39% | 9 | 1,047 LV | ±3% |
| Rasmussen Reports/Pulse Opinion Research | July 24 | 52% | 42% | 10 | 500 LV | ±4.5% |
| Public Policy Institute of California | July 8–22 | 50% | 35% | 15 | 1,401 LV | ±3% |
| Field Research Corporation (Field Poll) | July 8–14 | 54% | 30% | 24 | 672 LV | ±3.9% |
| Rasmussen Reports/Pulse Opinion Research | June 23 | 58% | 30% | 28 | 500 LV | ±4.5% |
| KABC-TV Los Angeles/KFSN-TV Fresno/KGTV-TV San Diego/KPIX-TV San Francisco/SurveyUSA | June 17–19 | 53% | 41% | 12 | 503 LV | ±4.5% |
| Field Research Corporation (Field Poll) | May 16–27 | 52% | 35% | 17 | 914 LV | ±3.4% |
| KTLA/Los Angeles Times | May 20–21 | 47% | 40% | 7 | 705 RV | ±4% |
| KABC-TV Los Angeles/KFSN-TV Fresno/KGTV-TV San Diego/KPIX-TV San Francisco/SurveyUSA | May 16–18 | 49% | 41% | 8 | 600 RV | ±4.1% |
| Public Policy Institute of California | May 12–18 | 54% | 37% | 17 | 1,086 LV | ±3% |
| Rasmussen Reports/Pulse Opinion Research | April 16 | 50% | 43% | 7 | 500 LV | ±4.5% |
| KABC-TV Los Angeles/KFSN-TV Fresno/KGTV-TV San Diego/KPIX-TV San Francisco/SurveyUSA | April 11–13 | 50% | 43% | 7 | 503 RV | ±4.5% |
| Public Policy Institute of California | March 11–18 | 49% | 40% | 9 | 1,077 LV | ±3% |
| KABC-TV Los Angeles/KFSN-TV Fresno/KGTV-TV San Diego/KPIX-TV San Francisco/SurveyUSA | March 14–16 | 54% | 40% | 14 | 489 RV | ±4.5% |
| Rasmussen Reports/Pulse Opinion Research | March 12 | 53% | 38% | 15 | 500 LV | ±4.5% |
| SurveyUSA | February 26–28 | 51% | 40% | 11 | 593 RV | ±4.1% |
| KABC-TV Los Angeles/KFSN-TV Fresno/KGTV-TV San Diego/KPIX-TV San Francisco/SurveyUSA | February 15–17 | 61% | 34% | 27 | 512 RV | ±4.3% |
| Field Research Corporation (Field Poll) | January 25–February 1 | 47% | 40% | 7 | Not reported | Not reported |
| KABC-TV Los Angeles/KFSN-TV Fresno/KGTV-TV San Diego/KPIX-TV San Francisco/SurveyUSA | January 20–21 | 50% | 44% | 6 | 519 RV | ±4.4% |
| KABC-TV Los Angeles/KFSN-TV Fresno/KGTV-TV San Diego/KPIX-TV San Francisco/SurveyUSA | December 15–17 | 52% | 39% | 13 | 512 RV | ±4.4% |
| Field Research Corporation (Field Poll) | December 10–17 | 50% | 36% | 14 | 1,053 LV | ±4.5% |
| KABC-TV Los Angeles/KFSN-TV Fresno/KGTV-TV San Diego/KPIX-TV San Francisco/SurveyUSA | November 9–11, 2007 | 52% | 39% | 13 | 502 RV | ±4.5% |
| Field Research Corporation (Field Poll) | October 11–21, 2007 | 50% | 33% | 17 | Not reported | Not reported |
| Field Research Corporation (Field Poll) | August 3–12, 2007 | 49% | 36% | 13 | Not reported | Not reported |
| Field Research Corporation (Field Poll) | March 21–31, 2007 | 51% | 39% | 12 | 802 LV | ±5% |
Four-way race
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Bob Barr | Ralph Nader | Margin | Sample size | Margin of error |
| Field Research Corporation (Field Poll) | September 5–14 | 52% | 36% | 1% | 1% | 16 | 830 LV | ±3.5% |
| Zogby Interactive | June 11–30 | 52% | 32% | 5% | 1% | 20 | 4,557 LV | ±1.5% |

### Colorado

9 electoral votes (Republican in 2000 & 2004)
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Margin | Sample size | Margin of error |
| Fox News/Rasmussen Reports/Pulse Opinion Research | November 2 | 51% | 47% | 4 | 1,000 LV | ±3% |
| Polimetrix/YouGov | October 18–November 1 | 55% | 40% | 15 | 685 RV | Not reported |
| American Research Group | October 28–30 | 52% | 45% | 7 | 600 LV | ±4% |
| Public Policy Polling | October 28–30 | 54% | 44% | 10 | 2,023 LV | ±2.2% |
| Denver Post/Mason-Dixon Polling & Research | October 28–29 | 49% | 44% | 5 | 625 LV | ±4% |
| Marist College | October 27–28 | 51% | 45% | 6 | 682 LV | ±4% |
| CNN/Time/Opinion Research Corporation | October 23–28 | 53% | 45% | 8 | 774 LV | ±3.5% |
| Allstate/National Journal/Financial Dynamics | October 23–27 | 48% | 44% | 4 | 409 RV | ±4.9% |
| Fox News/Rasmussen Reports/Pulse Opinion Research | October 26 | 50% | 46% | 4 | 1,000 LV | ±3% |
| Politico/InsiderAdvantage | October 26 | 53% | 45% | 8 | 636 LV | ±3.8% |
| Associated Press/Roper/GfK Group | October 22–26 | 50% | 41% | 9 | 626 LV | ±3.9% |
| Rocky Mountain News/CBS4 News/Public Opinion Strategies/RBI Strategies | October 21–23 | 52% | 40% | 12 | 500 LV | ±4.4% |
| Poll Position/InsiderAdvantage | October 20 | 51% | 46% | 5 | 576 LV | ±4% |
| Zogby Interactive | October 17–20 | 48.2% | 47.9% | 0.3 | 951 LV | ±3.2% |
| Fox News/Rasmussen Reports/Pulse Opinion Research | October 19 | 51% | 46% | 5 | 1,000 LV | ±3% |
| Rasmussen Reports/Pulse Opinion Research | October 16 | 52% | 45% | 7 | 700 LV | ±4% |
| CNN/Time/Opinion Research Corporation | October 11–14 | 51% | 47% | 4 | 762 LV | ±3.5% |
| Washington Post/Wall Street Journal/Quinnipiac University | October 8–12 | 52% | 43% | 9 | 1,088 LV | ±3% |
| Public Policy Polling | October 8–10 | 52% | 42% | 10 | 1,331 LV | ±2.7% |
| Poll Position/InsiderAdvantage | October 6 | 51% | 45% | 6 | 485 LV | ±5% |
| Fox News/Rasmussen Reports/Pulse Opinion Research | October 5 | 51% | 45% | 6 | 1,000 LV | ±3% |
| Denver Post/Mason-Dixon Polling & Research | September 29–October 1 | 44% | 44% | Tied | 625 LV | ±4% |
| Fox News/Rasmussen Reports/Pulse Opinion Research | September 28 | 49% | 48% | 1 | 500 LV | ±4.5% |
| American Research Group | September 23–25 | 45% | 48% | 3 | 600 LV | ±4% |
| Poll Position/InsiderAdvantage | September 23 | 50% | 41% | 9 | 505 LV | ±4.3% |
| Rasmussen Reports/Pulse Opinion Research | September 23 | 50% | 46% | 4 | 700 LV | ±4% |
| CNN/Time/Opinion Research Corporation | September 21–23 | 51% | 47% | 4 | 794 LV | ±3.5% |
| Economic Development Council of Colorado/Ciruli Associates | September 19–23 | 44% | 43% | 1 | 501 LV | ±4.4% |
| Public Policy Polling | September 20–21 | 51% | 44% | 7 | 1,084 LV | ±3.0% |
| Washington Post/Wall Street Journal/Quinnipiac University | September 14–21 | 49% | 45% | 4 | 1,418 LV | ±2.6% |
| Poll Position/InsiderAdvantage | September 17 | 51% | 41% | 10 | 508 LV | ±4.3% |
| Allstate/National Journal/Financial Dynamics | September 11–15 | 45% | 44% | 1 | 400 RV | ±4.9% |
| Fox News/Rasmussen Reports/Pulse Opinion Research | September 14 | 46% | 48% | 2 | 500 LV | ±4.5% |
| American Research Group | September 10–13 | 44% | 46% | 2 | 600 LV | ±4% |
| Zogby Interactive | September 9–12 | 45.5% | 47.5% | 2 | 825 LV | ±3.5% |
| Poll Position/InsiderAdvantage | September 10 | 49% | 46% | 3 | 501 LV | ±4.3% |
| Public Policy Polling | September 7–9 | 47% | 46% | 1 | 1,078 LV | ±3% |
| Fox News/Rasmussen Reports/Pulse Opinion Research | September 7 | 49% | 46% | 3 | 500 LV | ±4.5% |
| National Republican Senatorial Committee/Tarrance Group (R) | September 2–3 | 45% | 47% | 2 | 495 LV | ±4.5% |
| CNN/Time/Opinion Research Corporation | August 24–26 | 46% | 47% | 1 | 670 RV | ±3.5% |
| Hill Research Consultants (R) | August 23–24 | 43% | 40% | 3 | 553 LV | ±4.2% |
| Quinnipiac University | August 15–21 | 46% | 47% | 1 | 1,060 LV | ±3% |
| Zogby Interactive | August 15–19 | 44% | 41% | 3 | 717 LV | ±3.7% |
| Las Vegas Review-Journal/Mason-Dixon Polling & Research | August 13–15 | 46% | 43% | 3 | 400 LV | ±5% |
| Rasmussen Reports/Pulse Opinion Research | August 13 | 48% | 49% | 1 | 700 LV | ±4% |
| Public Policy Polling | August 5–7 | 48% | 44% | 4 | 933 LV | ±3.2% |
| Keith Frederick Polls | July 16–22 | 45% | 41% | 4 | 700 RV | ±3.7% |
| Washington Post/Wall Street Journal/Quinnipiac University | July 14–22 | 44% | 46% | 2 | 1,425 LV | ±2.6% |
| Rasmussen Reports/Pulse Opinion Research | July 21 | 50% | 47% | 3 | 500 LV | ±4.5% |
| Public Policy Polling | July 9–10 | 47% | 43% | 4 | 1,050 LV | ±3.0% |
| Washington Post/Wall Street Journal/Quinnipiac University | June 17–24 | 49% | 44% | 5 | 1,351 LV | ±2.7% |
| Rasmussen Reports/Pulse Opinion Research | June 17 | 43% | 41% | 2 | 500 LV | ±4.5% |
| Rasmussen Reports/Pulse Opinion Research | May 19 | 48% | 42% | 6 | 500 LV | ±4.5% |
| Rasmussen Reports/Pulse Opinion Research | April 16 | 46% | 43% | 3 | 500 LV | ±4.5% |
| New Leadership USA/TargetPoint (R) | March 31–April 7 | 39% | 51% | 12 | 604 LV | ±4% |
| Rasmussen Reports/Pulse Opinion Research | March 17 | 46% | 46% | Tied | 500 LV | ±4.5% |
| SurveyUSA | February 26–28 | 50% | 41% | 9 | 630 RV | ±4% |
| Rasmussen Reports/Pulse Opinion Research | February 11 | 46% | 39% | 7 | 500 LV | ±4.5% |
Four-way race
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Bob Barr | Ralph Nader | Margin | Sample size | Margin of error |
| Zogby Interactive | August 15–19 | 44% | 38% | 8% | 2% | 6 | 717 LV | ±3.7% |
| Rocky Mountain News/CBS4 News/Public Opinion Strategies/RBI Strategies | August 11–13 | 41% | 44% | 3% | 2% | 3 | 500 RV | ±4.38% |
| Zogby Interactive | June 11–30 | 40% | 38% | 8% | 2% | 2 | 780 LV | ±3.6% |
Five-way race
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Bob Barr | Ralph Nader | Cynthia McKinney | Margin | Sample size | Margin of error |
| Associated Press/Roper/GfK Group | October 22–26 | 50% | 41% | 1% | 0% | 0% | 9 | 626 LV | ±3.9% |
| Suffolk University | October 10–13 | 47% | 43% | 1% | 2% | 0% | 4 | 600 LV | ±4% |
| Suffolk University | August 21–24 | 44% | 39% | 2% | 2% | 0% | 5 | 450 LV | ±4.6% |

### Connecticut

7 electoral votes (Democrat in 2000 & 2004)
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Margin | Sample size | Margin of error |
| Polimetrix/YouGov | October 18–November 1 | 58% | 37% | 21 | 704 RV | Not reported |
| Hartford Courant/University of Connecticut | October 18–22 | 56% | 31% | 25 | 502 LV | ±4% |
| Rasmussen Reports/Pulse Opinion Research | October 16 | 56% | 39% | 17 | 500 LV | ±4.5% |
| WABC-TV New York/SurveyUSA | September 24–25 | 54% | 38% | 16 | 686 LV | ±3.8% |
| Pulsar Research | September 19–23 | 49% | 35% | 14 | 500 LV | ±4% |
| American Research Group | September 17–19 | 54% | 39% | 15 | 600 LV | ±4% |
| Rasmussen Reports/Pulse Opinion Research | September 16 | 53% | 41% | 12 | 500 LV | ±4.5% |
| Rasmussen Reports/Pulse Opinion Research | July 31 | 53% | 40% | 13 | 500 LV | ±4.5% |
| Rasmussen Reports/Pulse Opinion Research | July 1 | 52% | 35% | 17 | 500 LV | ±4.5% |
| Quinnipiac University | June 26–29 | 56% | 35% | 21 | 2,437 LV | ±2% |
| Rasmussen Reports/Pulse Opinion Research | May 29 | 47% | 44% | 3 | 500 LV | ±4.5% |
| Quinnipiac University | March 19–24 | 52% | 35% | 17 | 1,697 RV | ±2.4% |
| Rasmussen Reports/Pulse Opinion Research | March 11 | 50% | 38% | 12 | 500 LV | ±4.5% |
| SurveyUSA | February 26–28 | 55% | 34% | 21 | 640 RV | ±3.9% |
| Quinnipiac University | May 2–7, 2007 | 46% | 38% | 8 | 1,427 RV | ±2.6% |
| Quinnipiac University | February 9–12, 2007 | 43% | 38% | 5 | 1,087 RV | ±3% |
Four-way race
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Bob Barr | Ralph Nader | Margin | Sample size | Margin of error |
| Zogby Interactive | June 11–30 | 48% | 32% | 5% | 2% | 16 | 595 LV | ±4.1% |

### Delaware

3 electoral votes (Democrat in 2000 & 2004)
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Margin | Sample size | Margin of error |
| Polimetrix/YouGov | October 18–November 1 | 59% | 37% | 22 | 346 RV | Not reported |
| WCAU-TV Philadelphia/SurveyUSA | October 27–28 | 63% | 33% | 30 | 657 LV | ±3.8% |
| Rasmussen Reports/Pulse Opinion Research | October 10 | 56% | 41% | 15 | 500 LV | ±4.5% |
| West Chester University | October 6–8 | 55.5% | 38.4% | 17.1 | 429 LV | ±4.8% |
| WCAU-TV Philadelphia/SurveyUSA | September 22–23 | 57% | 37% | 20 | 703 LV | ±3.7% |
| Fairleigh Dickinson University (PublicMind) | September 17–21 | 56% | 36% | 20 | 601 LV | ±4% |
| American Research Group | September 13–15 | 51% | 40% | 11 | 600 LV | ±4% |
| Rasmussen Reports/Pulse Opinion Research | September 13 | 55% | 43% | 12 | 500 LV | ±4.5% |
| SurveyUSA | February 26–28 | 50% | 41% | 9 | 608 RV | ±4.1% |

### District of Columbia

3 electoral votes (Democrat in 2000 & 2004)
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Margin | Sample size | Margin of error |
| Polimetrix/YouGov | October 18–November 1 | 81% | 15% | 66 | 228 RV | Not reported |
| American Research Group | September 11–13 | 82% | 13% | 69 | 600 LV | ±4% |

### Florida

27 electoral votes (Republican in 2000 & 2004)
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Margin | Sample size | Margin of error |
| WFLA-TV Tampa/WFOR-TV Miami/WFTX-TV Ft. Myers/WKRG-TV Mobile-Pensacola/SurveyUSA | October 31–November 3 | 50% | 47% | 3 | 691 LV | ±3.8% |
| Reuters/Zogby International | October 31–November 3 | 49.2% | 48% | 1.2 | 600 LV | ±4.1% |
| Datamar | November 1–2 | 47% | 48.2% | 1.2 | 657 RV | ±3.8% |
| Public Policy Polling | October 31–November 2 | 50% | 48% | 2 | 1,717 LV | ±2.4% |
| Quinnipiac University | October 27–November 2 | 47% | 45% | 2 | 1,773 LV | ±2.3% |
| Polimetrix/YouGov | October 18–November 1 | 49% | 47% | 2 | 1,001 RV | Not reported |
| American Research Group | October 29–31 | 50% | 46% | 4 | 600 LV | ±4% |
| Datamar | October 29–30 | 46.7% | 46.7% | Tied | 995 RV | ±3.1% |
| Mason-Dixon Polling & Research | October 28–29 | 47% | 45% | 2 | 625 LV | ±4% |
| CNN/Time/Opinion Research Corporation | October 23–28 | 51% | 47% | 4 | 747 LV | ±3.5% |
| Florida Chamber of Commerce | October 26–27 | 45% | 41% | 4 | 601 RV | ±3.9% |
| Los Angeles Times/Bloomberg | October 24–27 | 50% | 43% | 7 | 639 LV | ±3% |
| Allstate/National Journal/Financial Dynamics | October 23–27 | 48% | 44% | 4 | 402 RV | ±4.9% |
| Datamar | October 25–26 | 49.2% | 44.4% | 4.8 | 630 RV | ±3.9% |
| Reuters/Zogby International | October 23–26 | 47.2% | 46.9% | 0.3 | 600 LV | ±4.1% |
| Associated Press/Roper/GfK Group | October 22–26 | 45% | 43% | 2 | 600 LV | ±4.0% |
| Quinnipiac University | October 22–26 | 47% | 45% | 2 | 1,435 LV | ±2.6% |
| Politico/InsiderAdvantage | October 22 | 48% | 47% | 1 | 562 LV | ±4% |
| St. Petersburg Times/Miami Herald/Bay News 9/The Polling Company Inc./Schroth, Eldon & Associates Research | October 20–22 | 49% | 42% | 7 | 800 LV | ±3.5% |
| NBC News/Mason-Dixon Polling & Research | October 20–21 | 45% | 46% | 1 | 625 LV | ±4% |
| Quinnipiac University | October 16–21 | 49% | 44% | 5 | 1,433 LV | ±2.6% |
| Zogby Interactive | October 17–20 | 48.8% | 45.2% | 3.6 | 1,252 LV | ±2.8% |
| Public Policy Polling | October 16–19 | 48% | 47% | 1 | 1,158 LV | ±2.9% |
| WFLA-TV Tampa/WFOR-TV Miami/WFTX-TV Ft. Myers/WKRG-TV Mobile-Pensacola/SurveyUSA | October 16 | 45% | 47% | 2 | 553 LV | ±4.3% |
| CNN/Time/Opinion Research Corporation | October 11–14 | 51% | 46% | 5 | 765 LV | ±3.5% |
| Poll Position/InsiderAdvantage | October 13 | 48% | 44% | 4 | 612 LV | ±3.8% |
| Datamar | October 12–13 | 47.1% | 42.1% | 5 | 1,328 RV | ±2.7% |
| Zogby Interactive | October 9–13 | 48.2% | 47.1% | 1.1 | 1,231 LV | ±2.9% |
| Rasmussen Reports/Pulse Opinion Research | October 8 | 50% | 47% | 3 | 700 LV | ±4% |
| Mason-Dixon Polling & Research | October 4–6 | 48% | 46% | 2 | 625 LV | ±4% |
| Poll Position/InsiderAdvantage | September 30 | 49% | 46% | 3 | 532 LV | ±4% |
| CNN/Time/Opinion Research Corporation | September 27–30 | 51% | 47% | 4 | 770 LV | ±3.5% |
| Quinnipiac University | September 27–29 | 51% | 43% | 8 | 836 LV | ±3.4% |
| WFLA-TV Tampa/WFOR-TV Miami/WFTX-TV Ft. Myers/WKRG-TV Mobile-Pensacola/SurveyUSA | September 27–28 | 47% | 48% | 1 | 599 LV | ±4.1% |
| Public Policy Polling | September 27–28 | 49% | 46% | 3 | 941 LV | ±3.2% |
| Quinnipiac University | September 22–26 | 49% | 43% | 6 | 1,161 LV | ±2.9% |
| American Research Group | September 23–25 | 47% | 46% | 1 | 600 LV | ±4% |
| Rasmussen Reports/Pulse Opinion Research | September 24 | 47% | 48% | 1 | 700 LV | ±4% |
| NBC News/Mason-Dixon Polling & Research | September 16–18 | 47% | 45% | 2 | 625 LV | ±4% |
| WFLA-TV Tampa/WFOR-TV Miami/WFTX-TV Ft. Myers/WKRG-TV Mobile-Pensacola/SurveyUSA | September 16–17 | 45% | 51% | 6 | 707 LV | ±3.8% |
| American Research Group | September 14–17 | 46% | 46% | Tied | 600 LV | ±4% |
| St. Petersburg Times/Miami Herald/Bay News 9/The Polling Company Inc./Schroth, Eldon & Associates Research | September 14–17 | 45% | 47% | 2 | 800 LV | ±3.5% |
| CNN/Time/Opinion Research Corporation | September 12–16 | 48% | 48% | Tied | 907 RV | ±3.5% |
| Allstate/National Journal/Financial Dynamics | September 11–15 | 44% | 44% | Tied | 402 RV | ±4.9% |
| Zogby Interactive | September 9–12 | 41.8% | 52.1% | 10.3 | 995 LV | ±3.2% |
| Poll Position/InsiderAdvantage | September 10 | 42% | 50% | 8 | 511 LV | ±4.3% |
| Quinnipiac University | September 5–9 | 43% | 50% | 7 | 1,032 LV | ±3.1% |
| Public Policy Polling | September 6–7 | 45% | 50% | 5 | 986 LV | ±3.1% |
| Mason-Dixon Polling & Research | August 25–26 | 45% | 44% | 1 | 625 LV | ±4% |
| Quinnipiac University | August 17–24 | 43% | 47% | 4 | 1,069 LV | ±3% |
| Florida Chamber of Commerce/The Kitchens Group | August 18–21 | 39% | 42% | 3 | 605 RV | ±4.0% |
| American Research Group | August 18–20 | 46% | 47% | 1 | 600 LV | ±4% |
| Zogby Interactive | August 15–19 | 40% | 45% | 5 | 894 LV | ±3.3% |
| Rasmussen Reports/Pulse Opinion Research | August 18 | 46% | 48% | 2 | 700 LV | ±4.5% |
| WFLA-TV Tampa/WKRG-TV Mobile-Pensacola/SurveyUSA | August 1–3 | 44% | 50% | 6 | 679 LV | ±3.8% |
| Public Policy Polling | July 30–August 2 | 44% | 47% | 3 | 807 LV | ±3.5% |
| Quinnipiac University | July 23–29 | 46% | 44% | 2 | 1,248 LV | ±2.8% |
| Florida Chamber of Commerce/Fabrizio, McLaughlin & Associates | July 20–28 | 40% | 45% | 5 | 1,600 RV | ±2.5% |
| Rasmussen Reports/Pulse Opinion Research | July 22 | 49% | 47% | 2 | 500 LV | ±4.5% |
| American Research Group | July 19–21 | 45% | 47% | 2 | 600 LV | ±4% |
| War Room Logistics | July 7–8 | 47.2% | 44.5% | 2.7 | 629 RV | ±4% |
| Public Policy Polling | June 26–29 | 46% | 44% | 2 | 723 LV | ±3.6% |
| Rasmussen Reports/Pulse Opinion Research | June 26 | 41% | 48% | 7 | 500 LV | ±4.5% |
| Rasmussen Reports/Pulse Opinion Research | June 18 | 39% | 47% | 8 | 500 LV | ±4.5% |
| American Research Group | June 13–17 | 49% | 44% | 5 | 600 LV | ±4% |
| Quinnipiac University | June 9–16 | 47% | 43% | 4 | 1,453 LV | ±2.6% |
| War Room Logistics | May 21–22 | 35.5% | 58.4% | 22.9 | 645 RV | Not reported |
| Quinnipiac University | May 13–20 | 41% | 45% | 4 | 1,419 RV | ±2.6% |
| Rasmussen Reports/Pulse Opinion Research | May 19 | 40% | 50% | 10 | 500 LV | ±4.5% |
| Quinnipiac University | April 23–29 | 43% | 44% | 1 | 1,411 RV | ±2.6% |
| Rasmussen Reports/Pulse Opinion Research | April 10 | 38% | 53% | 15 | 500 LV | ±4.5% |
| Quinnipiac University | March 24–31 | 37% | 46% | 9 | 1,136 RV | ±2.9% |
| Public Policy Polling | March 15–16 | 39% | 50% | 11 | 618 LV | ±3.9% |
| Rasmussen Reports/Pulse Opinion Research | March 12 | 43% | 47% | 4 | 500 LV | ±4.5% |
| SurveyUSA | February 26–28 | 45% | 47% | 2 | 632 RV | ±4% |
| Mason-Dixon Polling & Research | February 21–24 | 37% | 47% | 10 | 625 RV | ±4% |
| Rasmussen Reports/Pulse Opinion Research | February 16 | 37% | 53% | 16 | 500 LV | ±4.5% |
| Quinnipiac University | February 6–12 | 39% | 41% | 2 | 1,009 RV | ±3.1% |
| Public Policy Polling | January 4 | 40% | 46% | 6 | 543 LV | ±4.2% |
| St. Petersburg Times/The Polling Company Inc./Schroth, Eldon & Associates Research | November 4, 2007 | 45% | 47% | 2 | 800 RV | ±3.5% |
| Quinnipiac University | October 17–22, 2007 | 42% | 42% | Tied | 1,025 RV | ±3.1% |
| Quinnipiac University | October 1–8, 2007 | 39% | 41% | 2 | 869 RV | ±3.3% |
| Quinnipiac University | September 3–9, 2007 | 39% | 42% | 3 | 1,141 RV | ±2.9% |
| Quinnipiac University | July 12–16, 2007 | 42% | 38% | 4 | 1,106 RV | ±3% |
| Quinnipiac University | June 18–25, 2007 | 42% | 42% | Tied | 949 RV | ±3.2% |
| Quinnipiac University | May 24–June 4, 2007 | 40% | 41% | 1 | 1,174 RV | ±2.9% |
| Quinnipiac University | April 17–24, 2007 | 41% | 41% | Tied | 987 RV | ±3.1% |
| Quinnipiac University | March 21–27, 2007 | 39% | 45% | 6 | 1,061 RV | ±3% |
| Quinnipiac University | February 25–March 4, 2007 | 39% | 43% | 4 | 1,125 RV | ±2.9% |
| Quinnipiac University | January 29–February 4, 2007 | 40% | 42% | 2 | 1,003 RV | ±3.1% |
Three-way race
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Bob Barr | Margin | Sample size | Margin of error |
| Associated Press/Roper/GfK Group | October 22–26 | 45% | 43% | 1 | 2 | 600 LV | ±4.0% |
| Poll Position/InsiderAdvantage | August 11 | 44.2% | 47.8% | 2.4% | 4 | 418 LV | ±5% |
Four-way race
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Bob Barr | Ralph Nader | Margin | Sample size | Margin of error |
| Florida Chamber of Commerce (R) | September 30–October 1 | 42% | 45% | 1% | 1% | 3 | 619 RV | ±4% |
| Zogby Interactive | August 15–19 | 40% | 43% | 5% | 1% | 3 | 894 LV | ±3.3% |
| Zogby Interactive | June 11–30 | 39% | 43% | 6% | 2% | 4 | 3,731 LV | ±1.6% |
Five-way race
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Bob Barr | Ralph Nader | Cynthia McKinney | Margin | Sample size | Margin of error |
| Fox News/Rasmussen Reports/Pulse Opinion Research | November 2 | 49% | 50% | 0% | 0% | 0% | 1 | 1,000 LV | ±3% |
| Fox News/Rasmussen Reports/Pulse Opinion Research | October 26 | 51% | 47% | 0% | 0% | 0% | 4 | 1,000 LV | ±3% |
| Suffolk University | October 23–26 | 49% | 44% | 0% | 1% | 0% | 5 | 600 LV | ±4% |
| Fox News/Rasmussen Reports/Pulse Opinion Research | October 19 | 48% | 49% | 0% | 1% | 0% | 1 | 1,000 LV | ±3% |
| Hamilton Campaigns | October 10–15 | 47% | 43% | 1% | 1% | 0% | 4 | 700 RV | ±3.7% |
| Fox News/Rasmussen Reports/Pulse Opinion Research | October 12 | 51% | 46% | 1% | 0% | 0% | 5 | 1,000 LV | ±3% |
| Fox News/Rasmussen Reports/Pulse Opinion Research | October 5 | 52% | 45% | 0% | 1% | 0% | 7 | 1,000 LV | ±3% |
| WSVN/Suffolk University | September 27–30 | 46% | 42% | 2% | 1% | 1% | 4 | 600 LV | ±4% |
| Fox News/Rasmussen Reports/Pulse Opinion Research | September 28 | 47% | 47% | 0% | 1% | 0% | Tied | 500 LV | ±4.5% |
| Fox News/Rasmussen Reports/Pulse Opinion Research | September 21 | 46% | 51% | 0% | 0% | 0% | 5 | 500 LV | ±4.5% |
| Fox News/Rasmussen Reports/Pulse Opinion Research | September 14 | 44% | 49% | 2% | 2% | 0% | 5 | 500 LV | ±4.5% |
| Fox News/Rasmussen Reports/Pulse Opinion Research | September 7 | 48% | 48% | 0% | 2% | 0% | Tied | 500 LV | ±4.5% |

### Georgia

15 electoral votes (Republican in 2000 & 2004)
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Margin | Sample size | Margin of error |
| Poll Position/InsiderAdvantage | November 2 | 47% | 48% | 1 | 512 LV | ±4% |
| Public Policy Polling | October 31–November 2 | 48% | 50% | 2 | 1,253 LV | ±2.8% |
| WMAZ-TV Macon/WXIA-TV Atlanta/SurveyUSA | October 30–November 2 | 45% | 52% | 7 | 683 LV | ±3.8% |
| Polimetrix/YouGov | October 18–November 1 | 47% | 50% | 3 | 910 RV | Not reported |
| Rasmussen Reports/Pulse Opinion Research | October 30 | 47% | 52% | 5 | 500 LV | ±4.5% |
| CNN/Time/Opinion Research Corporation | October 23–28 | 47% | 52% | 5 | 690 LV | ±3.5% |
| Poll Position/Insider Advantage | October 23 | 48% | 47% | 1 | 615 LV | ±3.8% |
| NBC News/Mason-Dixon Research & Polling | October 22–23 | 43% | 49% | 6 | 625 LV | ±4% |
| Rasmussen Reports/Pulse Opinion Research | October 22 | 46% | 51% | 5 | 500 LV | ±4.5% |
| CNN/Time/Opinion Research Corporation | October 11–14 | 45% | 53% | 8 | 718 LV | ±3.5% |
| WMAZ-TV Macon/WXIA-TV Atlanta/SurveyUSA | October 11–12 | 43% | 51% | 8 | 547 LV | ±4.3% |
| Poll Position/InsiderAdvantage | October 9 | 46% | 49% | 3 | 531 LV | ±4% |
| Rasmussen Reports/Pulse Opinion Research | October 7 | 45% | 54% | 9 | 500 LV | ±4.5% |
| Poll Position/InsiderAdvantage | September 30 | 44% | 50% | 6 | 561 LV | ±4% |
| WMAZ-TV Macon/WXIA-TV Atlanta/SurveyUSA | September 28–29 | 44% | 52% | 8 | 677 LV | ±3.8% |
| American Research Group | September 18–21 | 39% | 57% | 18 | 600 LV | ±4% |
| Poll Position/InsiderAdvantage | September 17 | 43% | 51% | 8 | 503 LV | ±4.3% |
| Roll Call Newspaper/Capitol Hill/WMAZ-TV Macon/WXIA-TV Atlanta/SurveyUSA | September 14–16 | 41% | 57% | 16 | 684 LV | ±3.8% |
| Poll Position/InsiderAdvantage | September 10 | 38% | 56% | 18 | 506 LV | ±4% |
| Rasmussen Reports/Pulse Opinion Research | June 4 | 41% | 51% | 10 | 500 LV | ±4.5% |
| Rasmussen Reports/Pulse Opinion Research | May 6 | 39% | 53% | 14 | 500 LV | ±4.5% |
| Rasmussen Reports/Pulse Opinion Research | March 20 | 40% | 53% | 13 | 500 LV | ±4.5% |
| SurveyUSA | February 26–28 | 41% | 54% | 13 | 592 RV | ±4.1% |
Three-way race
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Bob Barr | Margin | Sample size | Margin of error |
| Poll Position/InsiderAdvantage | October 27 | 47% | 48% | 1% | 1 | 637 LV | ±3.8% |
| Rasmussen Reports/Pulse Opinion Research | September 16 | 43% | 54% | 0% | 11 | 500 LV | ±4.5% |
| Public Opinion Strategies (R) | September 9–11 | 35% | 56% | 1% | 21 | 800 LV | ±3.5% |
| Rasmussen Reports/Pulse Opinion Research | August 14 | 44% | 53% | 1% | 9 | 500 LV | ±4.5% |
| Rasmussen Reports/Pulse Opinion Research | July 17 | 42% | 53% | 1% | 11 | 500 LV | ±4.5% |
| Poll Position/Majority Opinion/InsiderAdvantage | July 2 | 44% | 46% | 4% | 2 | 502 LV | ±4.3% |
| Rasmussen Reports/Pulse Opinion Research | June 26 | 43% | 53% | 1% | 10 | 800 LV | ±4% |
| Poll Position/Majority Opinion/InsiderAdvantage | June 18 | 42.7% | 44.3% | 5.6% | 1.6 | 408 LV | ±5% |
| Majority Opinion/InsiderAdvantage | May 20 | 34.8% | 45.2% | 7.6% | 10.4 | 652 LV | ±3.6% |
Four-way race
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Bob Barr | Ralph Nader | Margin | Sample size | Margin of error |
| Democracy Corps/Greenberg Quinlan Rosner (D) | October 16–19 | 44% | 46% | 2% | 2% | 2 | 600 LV | ±4% |
| Zogby Interactive | June 11–30 | 38% | 44% | 8% | <1% | 6 | 1,472 LV | ±2.6% |

### Hawaii

4 electoral votes (Democrat in 2000 & 2004)
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Margin | Sample size | Margin of error |
| Polimetrix/YouGov | October 18–November 1 | 56% | 34% | 22 | 337 RV | Not reported |
| Rasmussen Reports/Pulse Opinion Research | September 23 | 68% | 27% | 41 | 500 LV | ±4.5% |
| American Research Group | September 7–12 | 63% | 32% | 31 | 600 LV | ±4% |
| SurveyUSA | February 26–29 | 61% | 31% | 30 | 592 RV | ±4% |

### Idaho

4 electoral votes (Republican in 2000 & 2004)
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Margin | Sample size | Margin of error |
| Polimetrix/YouGov | October 18–November 1 | 36% | 59% | 23 | 372 RV | Not reported |
| American Research Group | September 8–10 | 25% | 68% | 43 | 600 LV | ±4% |
| Rasmussen Reports/Pulse Opinion Research | September 9 | 29% | 68% | 39 | 500 LV | ±4.5% |
| Greg Smith & Associates | August 18–22 | 29% | 52% | 23 | 600 LV | ±4% |
| SurveyUSA | February 26–28 | 39% | 52% | 13 | 608 RV | ±4.1% |
Five-way race
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Bob Barr | Ralph Nader | Cynthia McKinney | Margin | Sample size | Margin of error |
| Harstad Strategic Research, Inc. | October 19–22 | 32% | 55% | 1% | 1% | 0% | 23 | 503 LV | ±4.4% |

### Illinois

21 electoral votes (Democrat in 2000 & 2004)
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Margin | Sample size | Margin of error |
| Rasmussen Reports/Pulse Opinion Research | November 1 | 60% | 38% | 22 | 500 LV | ±4.5% |
| Polimetrix/YouGov | October 18–November 1 | 58% | 39% | 19 | 783 RV | Not reported |
| Big Ten | October 19–22 | 61.2% | 31.6% | 29.6 | 572 RV | ±4% |
| Rasmussen Reports/Pulse Opinion Research | October 13 | 56% | 39% | 17 | 500 LV | ±4.5% |
| Rasmussen Reports/Pulse Opinion Research | September 17 | 56% | 40% | 16 | 500 LV | ±4.5% |
| Big Ten | September 14–17 | 52.9% | 37% | 15.9 | 628 RV | ±4% |
| American Research Group | September 13–16 | 51% | 45% | 6 | 600 LV | ±4% |
| Rasmussen Reports/Pulse Opinion Research | August 12 | 55% | 40% | 15 | 500 LV | ±4.5% |
| | July 8 | 52% | 41% | 11 | 500 LV | ±4.5% |
| SurveyUSA | February 26–28 | 60% | 31% | 29 | 600 RV | ±4% |
Four-way race
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Bob Barr | Ralph Nader | Margin | Sample size | Margin of error |
| Chicago Tribune/Market Shares Corporation | October 16–18 | 56% | 32% | 0% | 2% | 24 | 500 LV | ±4.4% |
| Zogby Interactive | June 11–30 | 52% | 32% | 5% | 1% | 20 | 1,514 LV | ±2.6% |

### Indiana

11 electoral votes (Republican in 2000 & 2004)
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Margin | Sample size | Margin of error |
| Reuters/Zogby International | October 31–November 3 | 43.9% | 49.1% | 5.2 | 585 LV | ±4.1% |
| Public Policy Polling | October 31–November 2 | 49% | 48% | 1 | 2,634 LV | ±1.9% |
| Polimetrix/YouGov | October 18–November 1 | 45% | 53% | 8 | 789 RV | Not reported |
| American Research Group | October 28–31 | 48% | 48% | Tied | 600 LV | ±4% |
| Rasmussen Reports/Pulse Opinion Research | October 28–29 | 46% | 49% | 3 | 500 LV | ±4.5% |
| WTHR-TV/Indianapolis Star/Selzer & Co. | October 26–28 | 45.9% | 45.3% | 0.6 | 606 LV | ±4% |
| Reuters/Zogby International | October 23–26 | 44% | 50.2% | 6.2 | 601 LV | ±4.1% |
| Howey Politics/Gauge Market Research | October 23–24 | 45% | 47% | 2 | 600 LV | ±4.1% |
| WHAS-TV Louisville/SurveyUSA | October 21–22 | 49% | 45% | 4 | 631 LV | 4% |
| Big Ten | October 19–22 | 51% | 41.5% | 9.5 | 586 RV | ±4.2% |
| Zogby Interactive | October 17–20 | 42.3% | 52.8% | 10.5 | 473 LV | ±4.6% |
| Public Policy Polling | October 18–19 | 48% | 46% | 2 | 1,411 LV | ±2.6% |
| Zogby Interactive | October 9–13 | 44.3% | 48.5% | 4.2 | 450 LV | ±4.7% |
| Rasmussen Reports/Pulse Opinion Research | October 7 | 43% | 50% | 7 | 500 LV | ±4.5% |
| CNN/Time/Opinion Research Corporation | October 3–6 | 46% | 51% | 5 | 677 LV | ±4% |
| WCPO-TV Cincinnati/WHAS-TV Louisville/SurveyUSA | September 28–29 | 45% | 48% | 3 | 687 LV | ±3.8% |
| Rasmussen Reports/Pulse Opinion Research | September 17–18 | 47% | 49% | 2 | 500 LV | ±4.5% |
| American Research Group | September 14–18 | 44% | 47% | 3 | 600 LV | ±4% |
| Big Ten | September 14–17 | 43.2% | 46.7% | 3.5 | 612 RV | ±4% |
| WTHR-TV/Indianapolis Star/Selzer & Co. | September 14–16 | 47% | 44% | 3 | 600 LV | ±4% |
| CNN/Time/Opinion Research Corporation | September 13–14 | 45% | 51% | 6 | 890 RV | ±3.5% |
| Howey Politics/Gauge Market Research | August 29–30 | 43% | 45% | 2 | 600 RV | Not reported |
| Rasmussen Reports/Pulse Opinion Research | August 19–21 | 43% | 49% | 6 | 500 LV | ±4.5% |
| WCPO-TV Cincinnati/WHAS-TV Louisville/SurveyUSA | August 16–18 | 44% | 50% | 6 | 645 LV | ±3.9% |
| WCPO-TV Cincinnati/WHAS-TV Louisville/SurveyUSA | June 21–23 | 48% | 47% | 1 | 627 LV | ±4% |
| Indiana Legislative Insight | May 27–June 1 | 39% | 47% | 8 | 601 RV | ±4% |
| Mike Downs Center/SurveyUSA | April 28–30 | 48% | 47% | 1 | 1,274 LV | ±2.8% |
| WTHR-TV/Indianapolis Star/Selzer & Co. | April 20–23 | 49% | 41% | 8 | 384 LV | Not reported |
| Mike Downs Center/SurveyUSA | April 14–16 | 44% | 51% | 7 | 1,254 LV | ±2.8% |
| SurveyUSA | February 26–28 | 41% | 50% | 9 | 575 RV | ±4.2% |
| WHAS-TV Louisville/SurveyUSA | February 3–4 | 40% | 50% | 10 | 499 RV | ±4.5% |
Three-way race
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Bob Barr | Margin | Sample size | Margin of error |
| Mike Downs Center/SurveyUSA | October 27–30 | 47% | 47% | 2% | Tied | 900 LV | ±3.3% |
Four-way race
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Bob Barr | Ralph Nader | Margin | Sample size | Margin of error |
| Zogby Interactive | June 11–30 | 39% | 40% | 7% | <1% | 1 | 758 LV | ±3.6% |

### Iowa

7 electoral votes (Democrat in 2000) (Republican in 2004)
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Margin | Sample size | Margin of error |
| Polimetrix/YouGov | October 18–November 1 | 52% | 41% | 11 | 795 RV | Not reported |
| Des Moines Register/Selzer & Co. | October 28–31 | 54% | 37% | 17 | 814 LV | ±3.4% |
| KAAL-TV Rochester-Mason City-Austin/WHO-TV Des Moines/SurveyUSA | October 28–29 | 55% | 40% | 15 | 658 LV | ±3.9% |
| Marist College | October 23–24 | 52% | 42% | 10 | 645 LV | ±4% |
| Rasmussen Reports/Pulse Opinion Research | October 23 | 52% | 44% | 8 | 700 LV | ±4% |
| NBC News/Mason-Dixon Research & Polling | October 22–23 | 51% | 40% | 11 | 625 LV | ±4% |
| Big Ten | October 19–22 | 52.4% | 39.1% | 13.3 | 586 LV | ±4.2% |
| KAAL-TV Rochester-Mason City-Austin/WHO-TV Des Moines/SurveyUSA | October 8–9 | 54% | 41% | 13 | 692 LV | ±3.8% |
| Rasmussen Reports/Pulse Opinion Research | September 25 | 51% | 43% | 8 | 700 LV | ±4% |
| Marist College | September 18–21 | 51% | 41% | 10 | 467 LV | ±4.5% |
| American Research Group | September 17–20 | 51% | 44% | 7 | 600 LV | ±4% |
| KAAL-TV Rochester-Mason City-Austin/WHO-TV Des Moines/SurveyUSA | September 17–18 | 54% | 43% | 11 | 702 LV | ±3.8% |
| Big Ten | September 14–17 | 44.8% | 44.8% | Tied | 643 RV | ±4% |
| CNN/Time/Opinion Research Corporation | August 31–September 2 | 55% | 40% | 15 | 828 RV | ±3.5% |
| University of Iowa | August 4–13 | 49.5% | 43.1% | 6.4 | 617 LV | ±3.9% |
| Rasmussen Reports/Pulse Opinion Research | August 7 | 49% | 44% | 5 | 700 LV | ±4% |
| | July 10 | 51% | 41% | 10 | 500 LV | ±4.5% |
| KAAL-TV Rochester-Mason City-Austin/SurveyUSA | June 13–16 | 49% | 45% | 4 | 528 RV | ±4.4% |
| Rasmussen Reports/Pulse Opinion Research | June 10 | 45% | 38% | 7 | 500 LV | ±4.5% |
| KAAL-TV Rochester-Mason City-Austin/SurveyUSA | May 21–22 | 47% | 38% | 9 | 600 RV | ±4.1% |
| Rasmussen Reports/Pulse Opinion Research | May 13 | 44% | 42% | 2 | 500 LV | ±4.5% |
| KAAL-TV Rochester-Mason City-Austin/SurveyUSA | April 11–13 | 49% | 42% | 7 | 553 RV | ±4.3% |
| Rasmussen Reports/Pulse Opinion Research | March 31 | 46% | 42% | 4 | 500 LV | ±4.5% |
| KAAL-TV Rochester-Mason City-Austin/SurveyUSA | March 14–16 | 50% | 44% | 6 | 517 RV | ±4.4% |
| SurveyUSA | February 26–28 | 50% | 41% | 9 | 619 RV | ±4% |
| Des Moines Register/Selzer & Co. | February 17–20 | 53% | 36% | 17 | 647 LV | Not reported |
| Rasmussen Reports/Pulse Opinion Research | February 18 | 44% | 41% | 3 | 500 LV | ±4.5% |
| KAAL-TV Rochester-Mason City-Austin/SurveyUSA | February 15–17 | 51% | 41% | 10 | 563 RV | ±4.2% |
| KAAL-TV Rochester-Mason City-Austin/SurveyUSA | January 4–6 | 55% | 38% | 17 | 543 RV | ±4.3% |
| KAAL-TV Rochester-Mason City-Austin/SurveyUSA | December 13–15, 2007 | 51% | 39% | 12 | 539 RV | ±4.3% |
| KAAL-TV Rochester-Mason City-Austin/SurveyUSA | November 9–11, 2007 | 50% | 42% | 8 | 546 RV | ±4.3% |
| KAAL-TV Rochester-Mason City-Austin/SurveyUSA | March 9–11, 2007 | 48% | 43% | 5 | Not reported | Not reported |
| KAAL-TV Rochester-Mason City-Austin/SurveyUSA | February 9–11, 2007 | 46% | 43% | 3 | Not reported | Not reported |
| KAAL-TV Rochester-Mason City-Austin/SurveyUSA | January 12–14, 2007 | 45% | 46% | 1 | 497 RV | ±4.5% |
Four-way race
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Bob Barr | Ralph Nader | Margin | Sample size | Margin of error |
| Des Moines Register/Selzer & Co. | September 8–10 | 52% | 40% | 2% | 1% | 12 | 616 LV | ±4% |
| Zogby Interactive | June 11–30 | 42% | 38% | 8% | 1% | 4 | 641 LV | ±3.9% |

### Kansas

6 electoral votes (Republican in 2000 & 2004)
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Margin | Sample size | Margin of error |
| Polimetrix/YouGov | October 18–November 1 | 41% | 52% | 11 | 499 RV | Not reported |
| KCTV-TV Kansas City/KWCH-TV Wichita/SurveyUSA | October 27–28 | 37% | 58% | 21 | 626 LV | ±3.9% |
| KCTV-TV Kansas City/KWCH-TV Wichita/SurveyUSA | October 21–22 | 41% | 53% | 12 | 613 LV | ±4% |
| Rasmussen Reports/Pulse Opinion Research | October 13 | 41% | 54% | 13 | 500 LV | ±4.5% |
| KCTV-TV Kansas City/KWCH-TV Wichita/SurveyUSA | September 21–22 | 41% | 53% | 12 | 666 LV | ±3.9% |
| Rasmussen Reports/Pulse Opinion Research | September 18 | 38% | 58% | 20 | 500 LV | ±4.5% |
| KCTV-TV Kansas City/KWCH-TV Wichita/SurveyUSA | August 18–20 | 35% | 58% | 23 | 641 LV | ±3.9% |
| Rasmussen Reports/Pulse Opinion Research | August 11 | 41% | 55% | 14 | 500 LV | ±4.5% |
| | July 14 | 35% | 58% | 23 | 500 LV | ±4.5% |
| TargetPoint (R) | June 27–July 1 | 36% | 49% | 13 | 3004 RV | Not reported |
| Rasmussen Reports/Pulse Opinion Research | June 11 | 37% | 47% | 10 | 500 LV | ±4.5% |
| Cooper & Secrest Associates (D) | June 5–8 | 41% | 45% | 4 | 808 LV | ±3.5% |
| KCTV-TV Kansas City/KWCH-TV Wichita/SurveyUSA | May 16–18 | 39% | 49% | 10 | 600 RV | ±4.1% |
| Rasmussen Reports/Pulse Opinion Research | May 13 | 34% | 55% | 21 | 500 LV | ±4.5% |
| KCTV-TV Kansas City/KWCH-TV Wichita/SurveyUSA | April 11–13 | 37% | 54% | 17 | 516 RV | ±4.4% |
| SurveyUSA | February 26–28 | 41% | 50% | 9 | 598 RV | ±4.1% |
| KCTV-TV Kansas City/KWCH-TV Wichita/SurveyUSA | February 15–17 | 44% | 50% | 6 | 514 RV | ±4.4% |
| KCTV-TV Kansas City/KWCH-TV Wichita/SurveyUSA | December 13–15, 2007 | 36% | 56% | 20 | 529 RV | ±4.3% |

### Kentucky

8 electoral votes (Republican in 2000 & 2004)
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Margin | Sample size | Margin of error |
| WHAS-TV Louisville/WLEX-TV Lexington/SurveyUSA | October 29–November 1 | 40% | 56% | 16 | 616 LV | ±4% |
| Polimetrix/YouGov | October 18–November 1 | 41% | 53% | 12 | 489 RV | Not reported |
| Rasmussen Reports/Pulse Opinion Research | October 29 | 43% | 55% | 12 | 500 LV | ±4.5% |
| Louisville Courier-Journal/Mason-Dixon Polling & Research | October 27–29 | 42% | 51% | 9 | 817 LV | Not reported |
| Rasmussen Reports/Pulse Opinion Research | October 21 | 44% | 52% | 8 | 500 LV | ±4.5% |
| WHAS-TV Louisville/WLEX-TV Lexington/SurveyUSA | October 16–18 | 41% | 54% | 13 | 535 LV | ±4.3% |
| Rasmussen Reports/Pulse Opinion Research | September 30 | 42% | 52% | 10 | 500 LV | ±4.5% |
| Louisville Courier-Journal/Mason-Dixon Polling & Research | September 22–25 | 41% | 53% | 12 | 717 LV | Not reported |
| WCPO-Cincinnati/WHAS-TV Louisville/WLEX-TV Lexington/SurveyUSA | September 21–22 | 38% | 57% | 19 | 672 LV | ±3.8% |
| American Research Group | September 8–12 | 37% | 57% | 20 | 600 LV | ±4% |
| WCPO-Cincinnati/WHAS-TV Louisville/WLEX-TV Lexington/SurveyUSA | August 9–11 | 37% | 55% | 18 | 636 LV | ±3.9% |
| Rasmussen Reports/Pulse Opinion Research | July 29 | 43% | 52% | 9 | 500 LV | ±4.5% |
| | June 25 | 35% | 51% | 16 | 500 LV | ±4.5% |
| WCPO-Cincinnati/WHAS-TV Louisville/WLEX-TV Lexington/SurveyUSA | June 13–16 | 41% | 53% | 12 | 626 LV | ±4% |
| Rasmussen Reports/Pulse Opinion Research | May 22 | 32% | 57% | 25 | 500 LV | ±4.5% |
| WCPO-Cincinnati/WHAS-TV Louisville/SurveyUSA | April 11–13 | 29% | 63% | 34 | 538 RV | ±4.2% |
| WCPO-Cincinnati/WHAS-TV Louisville/SurveyUSA | March 14–16 | 28% | 64% | 36 | 535 RV | ±4.1% |
| SurveyUSA | February 26–28 | 33% | 54% | 21 | 605 RV | ±4.1% |
| WCPO-Cincinnati/WHAS-TV Louisville/SurveyUSA | December 13–15, 2007 | 35% | 53% | 18 | 534 RV | ±4.3% |
| WCPO-Cincinnati/WHAS-TV Louisville/SurveyUSA | November 9–11, 2007 | 34% | 56% | 22 | 560 RV | ±4.2% |
| WCPO-Cincinnati/WHAS-TV Louisville/SurveyUSA | February 12–14, 2007 | 39% | 54% | 15 | 504 RV | ±4.4% |
Four-way race
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Bob Barr | Ralph Nader | Sample size | Margin of error |
| Zogby Interactive | June 11–30 | 39% | 44% | 3% | 1% | 529 LV | ±4.3% |

### Louisiana

9 electoral votes (Republican in 2000 & 2004)
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Margin | Sample size | Margin of error |
| Polimetrix/YouGov | October 18–November 1 | 45% | 52% | 7 | 436 RV | Not reported |
| WAFB 9News/Loyola University | October 24–26 | 40% | 43% | 3 | 475 RV | ±4.5% |
| Southeastern Louisiana University | October 20–23 | 38.3% | 50.6% | 12.3 | 503 RV | ±4.46% |
| Rasmussen Reports/Pulse Opinion Research | October 21 | 41% | 57% | 16 | 500 LV | ±4.5% |
| Rasmussen Reports/Pulse Opinion Research | September 25 | 40% | 55% | 15 | 500 LV | ±4.5% |
| American Research Group | September 9–12 | 43% | 50% | 7 | 600 LV | ±4% |
| Rasmussen Reports/Pulse Opinion Research | August 17 | 39% | 57% | 18 | 500 LV | ±4.5% |
| Rasmussen Reports/Pulse Opinion Research | July 9 | 37% | 56% | 19 | 500 LV | ±4.5% |
| Southern Media & Opinion Research | June 26–28 | 35.5% | 52.2% | 16.7 | 600 LV | ±4% |
| Rasmussen Reports/Pulse Opinion Research | May 28 | 41% | 50% | 9 | 500 LV | ±4.5% |
| Southern Media & Opinion Research | March 26–April 9 | 35% | 51% | 16 | 600 LV | ±4% |
| SurveyUSA | February 26–28 | 39% | 54% | 15 | 599 RV | ±4.1% |
Four-way race
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Bob Barr | Ralph Nader | Margin | Sample size | Margin of error |
| Zogby Interactive | June 11–30 | 40% | 47% | 4% | 1% | 7 | 431 LV | ±4.8% |

### Maine

4 electoral votes (Democrat in 2000 & 2004)
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Margin | Sample size | Margin of error |
| Rasmussen Reports/Pulse Opinion Research | November 1 | 56% | 43% | 13 | 500 LV | ±4.5% |
| Polimetrix/YouGov | October 18–November 1 | 51% | 42% | 9 | 486 RV | Not reported |
| WCSH-TV Portland/WLBZ-TV Bangor/SurveyUSA | October 29–31 | 58% | 38% | 20 | 674 LV | ±3.8% |
| Market Decisions | October 13–26 | 52% | 33% | 19 | 425 A | ±4.8% |
| WCSH-TV Portland/WLBZ-TV Bangor/SurveyUSA | October 19–20 | 54% | 39% | 15 | 642 LV | ±3.9% |
| Critical Insights | October 16–19 | 56% | 35% | 21 | 443 LV | ±4.7% |
| Pan Atlantic SMS Group | October 13–16 | 51.3% | 38.5% | 12.8 | 400 LV | ±4.9% |
| Rasmussen Reports/Pulse Opinion Research | October 2 | 51% | 46% | 5 | 500 LV | ±4.5% |
| WCSH-TV Portland/WLBZ-TV Bangor/SurveyUSA | September 22–23 | 49% | 44% | 5 | 675 LV | ±3.8% |
| Rasmussen Reports/Pulse Opinion Research | September 17 | 50% | 46% | 4 | 500 LV | ±4.5% |
| American Research Group | September 8–10 | 51% | 41% | 10 | 600 LV | ±4% |
| Rasmussen Reports/Pulse Opinion Research | August 12 | 53% | 39% | 14 | 500 LV | ±4.5% |
| | July 17 | 49% | 41% | 8 | 500 LV | ±4.5% |
| Critical Insights | June 1–27 | 51% | 31% | 20 | 498 LV | ±4.5% |
| Pan Atlantic SMS Group | June 10–18 | 46.1% | 32.1% | 14 | 400 LV | ±4.9% |
| Rasmussen Reports/Pulse Opinion Research | June 16 | 55% | 33% | 22 | 500 LV | ±4.5% |
| Rasmussen Reports/Pulse Opinion Research | May 14 | 51% | 38% | 13 | 500 LV | ±4.5% |
| Rasmussen Reports/Pulse Opinion Research | April 1 | 49% | 39% | 10 | 500 LV | ±4.5% |
| SurveyUSA | February 26–28 | 53% | 39% | 14 | 639 RV | ±3.9% |
First congressional district
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Margin | Sample size | Margin of error |
| SurveyUSA | October 29–31 | 60% | 37% | 23 | Not reported | Not reported |
| Critical Insights | October 16–19 | 56% | 33% | 23 | 228 LV | Not reported |
| Pan Atlantic SMS Group | October 13–16 | 49.8% | 37.2% | 12.6 | 207 LV | ±6.81% |
Second congressional district
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Margin | Sample size | Margin of error |
| SurveyUSA | October 29–31 | 55% | 39% | 16 | Not reported | Not reported |
| Critical Insights | October 16–19 | 56% | 36% | 20 | 215 LV | Not reported |
| Pan Atlantic SMS Group | October 13–16 | 52.8% | 39.9% | 12.9 | 193 LV | ±7.05% |

### Maryland

10 electoral votes (Democrat in 2000 & 2004)
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Margin | Sample size | Margin of error |
| Polimetrix/YouGov | October 18–November 1 | 60% | 35% | 25 | 475 RV | Not reported |
| Rasmussen Reports/Pulse Opinion Research | September 20 | 60% | 37% | 23 | 500 LV | ±4.5% |
| American Research Group | September 17–19 | 54% | 39% | 15 | 600 LV | ±4% |
| Gonzales Research & Marketing Strategies Inc. | August 29–September 5 | 52% | 38% | 14 | 833 LV | ±3.5% |
| Rasmussen Reports/Pulse Opinion Research | August 18 | 53% | 43% | 10 | 500 LV | ±4.5% |
| Gonzales Research & Marketing Strategies Inc. | February 23–March 1 | 51% | 37% | 14 | 807 RV | ±3.5% |
| SurveyUSA | February 26–28 | 53% | 40% | 13 | 620 RV | ±4% |
| Rasmussen Reports/Pulse Opinion Research | January 2 | 48% | 42% | 6 | 500 LV | ±4.5% |
Four-way race
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Bob Barr | Ralph Nader | Margin | Sample size | Margin of error |
| Zogby Interactive | June 11–30 | 54% | 30% | 6% | 1% | 24 | 924 LV | ±3.3% |

### Massachusetts

12 electoral votes (Democrat in 2000 & 2004)
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Margin | Sample size | Margin of error |
| Polimetrix/YouGov | October 18–November 1 | 57% | 39% | 18 | 705 RV | Not reported |
| WBZ-TV Boston/SurveyUSA | October 27–28 | 56% | 39% | 17 | 658 LV | ±3.9% |
| WBZ-TV Boston/SurveyUSA | October 13–14 | 59% | 35% | 24 | 624 LV | ±3.9% |
| Rasmussen Reports/Pulse Opinion Research | October 13 | 62% | 34% | 28 | 500 LV | ±4.5% |
| WBZ-TV Boston/SurveyUSA | September 22–23 | 55% | 39% | 16 | 679 LV | ±3.8% |
| American Research Group | September 20–22 | 55% | 39% | 16 | 500 LV | ±4% |
| Rasmussen Reports/Pulse Opinion Research | August 5 | 54% | 38% | 16 | 500 LV | ±4.5% |
| | June 30 | 53% | 33% | 20 | 500 LV | ±4.5% |
| WBZ-TV Boston/SurveyUSA | June 25–27 | 53% | 40% | 13 | 607 LV | ±4.1% |
| Rasmussen Reports/Pulse Opinion Research | May 29 | 51% | 38% | 13 | 500 LV | ±4.5% |
| WBZ-TV Boston/SurveyUSA | May 16–18 | 46% | 41% | 5 | 600 RV | ±4.1% |
| Rasmussen Reports/Pulse Opinion Research | April 23 | 51% | 39% | 12 | 500 LV | ±4.5% |
| WBZ-TV Boston/SurveyUSA | April 11–13 | 48% | 46% | 2 | 546 RV | ±4.3% |
| Rasmussen Reports/Pulse Opinion Research | March 18 | 49% | 42% | 7 | 500 LV | ±4.5% |
| WBZ-TV Boston/SurveyUSA | March 14–16 | 47% | 47% | Tied | 510 RV | ±4.4% |
| SurveyUSA | February 26–28 | 49% | 42% | 7 | 636 RV | ±4% |
| WBZ-TV Boston/SurveyUSA | January 20–21 | 45% | 50% | 5 | 562 RV | ±4.2% |
| WBZ-TV Boston/SurveyUSA | December 13–15, 2007 | 47% | 45% | 2 | 542 RV | ±4.3% |
| WBZ-TV Boston/SurveyUSA | November 9–11, 2007 | 44% | 47% | 3 | 540 RV | ±4.3% |
| WBZ-TV Boston/WNYT-TV Albany/SurveyUSA | January 12–14, 2007 | 43% | 46% | 3 | 525 RV | ±4.4% |
Three-way race
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Ralph Nader | Margin | Sample size | Margin of error |
| 7News/Suffolk University | June 8–10 | 53% | 30% | 3% | 23 | 500 LV | ±4.40% |
Four-way race
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Bob Barr | Ralph Nader | Cynthia McKinney | Margin | Sample size | Margin of error |
| 7News/Suffolk University | July 31–August 3 | 47% | 38% | 1% | N/A | 1% | 9 | 400 LV | ±4.90% |
| Zogby Interactive | June 11–30 | 54% | 29% | 5% | 3% | N/A | 25 | 861 LV | ±3.4% |
Six-way race
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Bob Barr | Ralph Nader | Cynthia McKinney | Chuck Baldwin | Margin | Sample size | Margin of error |
| 7News/Suffolk University | October 20–22 | 53% | 34% | 1% | 3% | 1% | 1% | 19 | 400 LV | ±4.90% |

### Michigan

17 electoral votes (Democrat in 2000 & 2004)
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Margin | Sample size | Margin of error |
| Mitchell Research & Communications Inc. | November 3 | 54% | 38% | 16 | 400 LV | ±5% |
| Polimetrix/YouGov | October 18–November 1 | 55% | 42% | 13 | 973 RV | Not reported |
| Detroit Free Press-Local 4/Selzer & Co. | October 28–31 | 53% | 37% | 16 | 616 LV | ±4% |
| Public Policy Polling | October 28–30 | 55% | 42% | 13 | 1,532 LV | ±2.5% |
| Mitchell Research & Communications Inc. | October 26–30 | 54% | 40% | 14 | 600 LV | ±4% |
| Rasmussen Reports/Pulse Opinion Research | October 28 | 53% | 43% | 10 | 500 LV | ±4.5% |
| Detroit News/EPIC-MRA | October 26–28 | 50% | 38% | 12 | 400 LV | ±4.9% |
| Big Ten | October 19–22 | 58.1% | 35.8% | 22.3 | 562 LV | ±4.2% |
| Washington Post/Wall Street Journal/Quinnipiac University | October 8–12 | 54% | 38% | 16 | 1,043 LV | ±3% |
| Rasmussen Reports/Pulse Opinion Research | October 8 | 56% | 40% | 16 | 500 LV | ±4.5% |
| MIRS/Denno-Noor Research/The Rossman Group | October 1–4 | 44% | 39% | 5 | 600 RV | ±4% |
| Public Policy Polling | September 29–October 1 | 51% | 41% | 10 | 731 LV | ±3.6% |
| Detroit Free Press-Local 4/Selzer & Co. | September 22–24 | 51% | 38% | 13 | 602 LV | ±4% |
| CNN/Time/Opinion Research Corporation | September 21–23 | 51% | 46% | 5 | 755 LV | ±3.5% |
| NBC News/Mason-Dixon Polling & Research | September 18–23 | 46% | 46% | Tied | 625 LV | ±4% |
| Allstate/National Journal/Financial Dynamics | September 18–22 | 47% | 39% | 8 | 406 RV | ±4.9% |
| Washington Post/Wall Street Journal/Quinnipiac University | September 14–21 | 48% | 44% | 4 | 1,346 LV | ±2.7% |
| Inside Michigan Politics/Marketing Resource Group | September 15–20 | 43% | 46% | 3 | 600 LV | ±4.1% |
| American Research Group | September 16–19 | 48% | 46% | 2 | 600 LV | ±4% |
| Marist College | September 16–17 | 52% | 43% | 9 | 599 LV | ±4% |
| Big Ten | September 14–17 | 47.8% | 43.8% | 4 | 600 RV | ±4% |
| Michigan State University | July 20–September 14 | 45% | 33.3% | 11.7 | 1,010 A | ±3.1% |
| Zogby Interactive | September 9–12 | 49% | 43.3% | 5.7 | 742 LV | ±3.7% |
| Poll Position/InsiderAdvantage | September 10 | 44% | 45% | 1 | 503 LV | ±4.3% |
| Rasmussen Reports/Pulse Opinion Research | September 10 | 51% | 46% | 5 | 500 LV | ±4.5% |
| CNN/Time/Opinion Research Corporation | September 7–9 | 49% | 45% | 4 | 966 RV | ±3% |
| Public Policy Polling | September 6–7 | 47% | 46% | 1 | 1,147 LV | ±2.9% |
| Detroit Free Press-Local 4/WDIV/Selzer & Co. | August 17–20 | 46% | 39% | 7 | 600 LV | ±4% |
| Rasmussen Reports/Pulse Opinion Research | August 7 | 49% | 45% | 4 | 500 LV | ±4.5% |
| Public Policy Polling | July 23–27 | 46% | 43% | 3 | 883 LV | ±3.3% |
| Washington Post/Wall Street Journal/Quinnipiac University | July 14–22 | 46% | 42% | 4 | 1,684 LV | ±2.4% |
| Democracy Corps/Greenberg Quinlan Rosner (D) | July 14–21 | 48% | 43% | 5 | 764 LV | Not reported |
| Rasmussen Reports/Pulse Opinion Research | July 10 | 50% | 42% | 8 | 500 LV | ±4.5% |
| Washington Post/Wall Street Journal/Quinnipiac University | June 17–24 | 48% | 42% | 6 | 1,411 LV | ±2.6% |
| Public Policy Polling | June 21–22 | 48% | 39% | 9 | 573 LV | ±4.1% |
| Rasmussen Reports/Pulse Opinion Research | June 9 | 45% | 42% | 3 | 500 LV | ±4.5% |
| SurveyUSA | May 27 | 37% | 41% | 4 | 529 RV | ±4.3% |
| Detroit News/EPIC-MRA | May 19–22 | 40% | 44% | 4 | 600 LV | ±4% |
| Rasmussen Reports/Pulse Opinion Research | May 7 | 44% | 45% | 1 | 500 LV | ±4.5% |
| Rasmussen Reports/Pulse Opinion Research | March 25 | 42% | 43% | 1 | 500 LV | ±4.5% |
| Rasmussen Reports/Pulse Opinion Research | March 10 | 41% | 44% | 3 | 500 LV | ±4.5% |
| SurveyUSA | February 26–28 | 46% | 45% | 1 | 643 RV | ±3.9% |
| Rasmussen Reports/Pulse Opinion Research | February 17 | 47% | 39% | 8 | 500 LV | ±4.5% |
| Detroit Free Press-Local 4/Selzer & Co. | December 10–12, 2007 | 49% | 41% | 8 | Not reported | Not reported |
| EPIC-MRA | January 31–February 4, 2007 | 43% | 53% | 10 | 600 LV | ±4% |
| Detroit Free Press-Local 4/Selzer & Co. | January 28–31, 2007 | 44% | 39% | 5 | Not reported | ±3.8% |
Three-way race
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Ralph Nader | Margin | Sample size | Margin of error |
| EPIC-MRA | April 3–8 | 43% | 41% | 8% | 2 | 600 LV | ±4% |
Four-way race
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Bob Barr | Ralph Nader | Margin | Sample size | Margin of error |
| Detroit News/EPIC-MRA | October 19–20 | 51% | 37% | 1% | 1% | 14 | 400 LV | ±4.9% |
| Detroit News/EPIC-MRA | September 20–22 | 48% | 38% | 1% | 2% | 10 | 400 LV | ±4.9% |
| Detroit News/EPIC-MRA | September 14–17 | 43% | 42% | 2% | 2% | 1 | 602 LV | ±4% |
| Detroit News/EPIC-MRA | August 18–21 | 43% | 41% | 1% | 3% | 2 | 600 LV | ±4% |
| Zogby Interactive | August 15–19 | 46% | 37% | 5% | 1% | 9 | 609 LV | ±4.0% |
| Democracy Corps/Greenberg Quinlan Rosner (D) | July 14–21 | 46% | 39% | 3% | 6% | 7 | 764 LV | Not reported |
| Detroit News/EPIC-MRA | July 13–16 | 43% | 41% | 2% | 3% | 2 | 600 LV | ±4% |
| Zogby Interactive | June 11–30 | 47% | 33% | 6% | 2% | 14 | 1,349 LV | ±2.9% |
Five-way race
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Bob Barr | Ralph Nader | Cynthia McKinney | Margin | Sample size | Margin of error |
| Fox News/Rasmussen Reports/Pulse Opinion Research | September 21 | 51% | 44% | 1% | 1% | 0% | 7 | 500 LV | ±4.5% |

### Minnesota

10 electoral votes (Democrat in 2000 & 2004)
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Margin | Sample size | Margin of error |
| KAAL-TV Rochester-Mason City-Austin/KSTP-TV Minneapolis/WDIO-TV Duluth/SurveyUSA | October 30–November 1 | 49% | 46% | 3 | 669 LV | ±3.9% |
| Polimetrix/YouGov | October 18–November 1 | 51% | 45% | 6 | 699 RV | Not reported |
| Minnesota Star Tribune/Princeton Survey Research Associates International | October 28–31 | 53% | 42% | 11 | 933 LV | ±4.1% |
| Public Policy Polling | October 28–30 | 57% | 41% | 16 | 1,050 LV | ±3% |
| Rasmussen Reports/Pulse Opinion Research | October 28 | 55% | 43% | 12 | 500 LV | ±4.5% |
| NBC News/Mason-Dixon Polling & Research | October 27–28 | 48% | 40% | 8 | 625 LV | ±4% |
| Minnesota Public Radio/Humphrey Institute | October 24–28 | 56% | 37% | 19 | 451 LV | ±4.6% |
| Rasmussen Reports/Pulse Opinion Research | October 22 | 56% | 41% | 15 | 500 LV | ±4.5% |
| Big Ten | October 19–22 | 57.3% | 37.9% | 19.4 | 583 LV | ±4.2% |
| St. Cloud State University | October 14–22 | 42% | 37% | 5 | 509 A | ±4.6% |
| Allstate/National Journal/Financial Dynamics | October 16–20 | 50% | 40% | 10 | 402 RV | ±4.9% |
| KAAL-TV Rochester-Mason City-Austin/KSTP-TV Minneapolis/WDIO-TV Duluth/SurveyUSA | October 16–18 | 50% | 44% | 6 | 655 LV | ±3.9% |
| Minnesota Star Tribune/Princeton Survey Research Associates International | October 16–17 | 52% | 41% | 11 | 1,049 LV | ±3.8% |
| Washington Post/Wall Street Journal/Quinnipiac University | October 8–12 | 51% | 40% | 11 | 1,043 LV | ±3% |
| Rasmussen Reports/Pulse Opinion Research | October 7 | 52% | 45% | 7 | 500 LV | ±4.5% |
| American Research Group | October 4–7 | 47% | 46% | 1 | 600 LV | ±4% |
| Minnesota Public Radio/Humphrey Institute | October 3–5 | 54% | 40% | 14 | 418 LV | ±4.8% |
| Minnesota Star Tribune/Princeton Survey Research Associates International | September 30–October 2 | 55% | 37% | 18 | 1,084 LV | ±3.7% |
| KAAL-TV Rochester-Mason City-Austin/KSAX-TV Alexandria/KSTP-TV Minneapolis/WDIO-TV Duluth/SurveyUSA | September 30–October 1 | 46% | 47% | 1 | 725 LV | ±3.7% |
| CNN/Time/Opinion Research Corporation | September 28–30 | 54% | 43% | 11 | 849 LV | ±3.5% |
| Washington Post/Wall Street Journal/Quinnipiac University | September 14–21 | 47% | 45% | 2 | 1,301 LV | ±2.7% |
| American Research Group | September 18–20 | 48% | 47% | 1 | 600 LV | ±4% |
| Rasmussen Reports/Pulse Opinion Research | September 18 | 52% | 44% | 8 | 500 LV | ±4.5% |
| Big Ten | September 14–17 | 47.3% | 44.5% | 2.8 | 610 RV | ±4% |
| Minnesota Star Tribune/Princeton Survey Research Associates International | September 10–12 | 45% | 45% | Tied | 1,106 LV | ±3.9% |
| KAAL-TV Rochester-Mason City-Austin/KSAX-TV Alexandria/KSTP-TV Minneapolis/WDIO-TV Duluth/SurveyUSA | September 10–11 | 49% | 47% | 2 | 734 LV | ±3.4% |
| CNN/Time/Opinion Research Corporation | August 31–September 2 | 53% | 41% | 12 | 742 RV | ±3.5% |
| KSTP-TV Minneapolis/SurveyUSA | August 13–14 | 47% | 45% | 2 | 682 LV | ±3.8% |
| Rasmussen Reports/Pulse Opinion Research | August 13 | 49% | 45% | 4 | 700 LV | ±4.5% |
| | July 22 | 53% | 39% | 13 | 500 LV | ±4.5% |
| Washington Post/Wall Street Journal/Quinnipiac University | July 14–22 | 46% | 44% | 2 | 1,261 LV | ±2.8% |
| Rasmussen Reports/Pulse Opinion Research | July 10 | 54% | 37% | 17 | 500 LV | ±4.5% |
| Washington Post/Wall Street Journal/Quinnipiac University | June 17–24 | 54% | 37% | 17 | 1,572 LV | ±2.5% |
| KAAL-TV Rochester-Mason City-Austin/KSTP-TV Minneapolis/WDIO-TV Duluth/SurveyUSA | June 13–16 | 47% | 46% | 1 | 543 LV | ±4.3% |
| Rasmussen Reports/Pulse Opinion Research | June 11 | 52% | 39% | 13 | 500 LV | ±4.5% |
| Rasmussen Reports/Pulse Opinion Research | May 22 | 53% | 38% | 15 | 500 LV | ±4% |
| KAAL-TV Rochester-Mason City-Austin/KSTP-TV Minneapolis/WDIO-TV Duluth/SurveyUSA | May 16–18 | 47% | 42% | 5 | 600 RV | ±4.1% |
| Minnesota Star Tribune/Princeton Survey Research Associates International | May 12–15 | 51% | 38% | 13 | 1,117 RV | ±3.6% |
| Rasmussen Reports/Pulse Opinion Research | April 22 | 52% | 38% | 14 | 500 LV | ±4% |
| KAAL-TV Rochester-Mason City-Austin/KSTP-TV Minneapolis/WDIO-TV Duluth/SurveyUSA | April 11–13 | 49% | 43% | 6 | 535 RV | ±4.3% |
| Rasmussen Reports/Pulse Opinion Research | March 19 | 47% | 43% | 4 | 500 LV | ±4.5% |
| KAAL-TV Rochester-Mason City-Austin/KSTP-TV Minneapolis/WDIO-TV Duluth/SurveyUSA | March 14–16 | 46% | 47% | 1 | 532 RV | ±4.3% |
| SurveyUSA | February 26–28 | 49% | 42% | 7 | 608 RV | ±4.1% |
| Rasmussen Reports/Pulse Opinion Research | February 16 | 53% | 38% | 15 | 500 LV | ±4.5% |
| Minnesota Public Radio/Humphrey Institute | January 20–27 | 50% | 37% | 13 | 917 A | ±3.2% |
| KAAL-TV Rochester-Mason City-Austin/KSTP-TV Minneapolis/WDIO-TV Duluth/SurveyUSA | January 20–21 | 42% | 49% | 7 | 550 RV | ±4.3% |
| KAAL-TV Rochester-Mason City-Austin/KSTP-TV Minneapolis/WDIO-TV Duluth/SurveyUSA | December 13–15, 2007 | 41% | 50% | 9 | 556 RV | ±4.2% |
| KAAL-TV Rochester-Mason City-Austin/KSTP-TV Minneapolis/WDIO-TV Duluth/SurveyUSA | November 9–11, 2007 | 43% | 46% | 4 | 535 RV | ±4.3% |
| SurveyUSA | March 9–11, 2007 | 42% | 47% | 5 | Not reported | Not reported |
| KSTP-TV Minneapolis/SurveyUSA | February 12–13, 2007 | 43% | 49% | 6 | 632 RV | ±3.9% |
| KAAL-TV Rochester-Mason City-Austin/KSTP-TV Minneapolis/WDIO-TV Duluth/SurveyUSA | January 12–14, 2007 | 41% | 48% | 7 | 511 RV | ±4.4% |
Four-way race
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Bob Barr | Ralph Nader | Margin | Sample size | Margin of error |
| Minnesota Public Radio/Humphrey Institute | August 7–17 | 48% | 38% | 1% | 3% | 10 | 763 LV | ±3.6% |
| Zogby Interactive | June 11–30 | 48% | 32% | 8% | <1% | 16 | 830 LV | ±3.5% |

### Mississippi

6 electoral votes (Republican in 2000 & 2004)
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Margin | Sample size | Margin of error |
| Polimetrix/YouGov | October 18–November 1 | 42% | 55% | 13 | 417 RV | Not reported |
| Rasmussen Reports/Pulse Opinion Research | October 27 | 45% | 53% | 8 | 500 LV | ±4.5% |
| Press-Register/USA Polling Group/University of South Alabama | October 13–23 | 33% | 46% | 13 | 405 LV | ±5% |
| Rasmussen Reports/Pulse Opinion Research | September 30 | 44% | 52% | 8 | 500 LV | ±4.5% |
| American Research Group | September 13–16 | 39% | 55% | 16 | 600 LV | ±4% |
| Rasmussen Reports/Pulse Opinion Research | August 21 | 43% | 56% | 13 | 500 LV | ±4.5% |
| Rasmussen Reports/Pulse Opinion Research | July 28 | 42% | 54% | 12 | 500 LV | ±4% |
| Rasmussen Reports/Pulse Opinion Research | June 24 | 44% | 50% | 6 | 500 LV | ±4% |
| | May 27 | 44% | 50% | 6 | 500 LV | ±4% |
| SurveyUSA | February 26–28 | 41% | 54% | 13 | 622 RV | ±4% |

### Missouri

11 electoral votes (Republican in 2000 & 2004)
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Margin | Sample size | Margin of error |
| Reuters/Zogby International | October 31–November 3 | 48.8% | 48.8% | Tied | 600 LV | ±4.1% |
| Public Policy Polling | October 31–November 2 | 49.4% | 48.6% | 0.8 | 1,343 LV | ±2.7% |
| KCTV-TV Saint Louis/KMOX 1120 Radio St. Louis/SurveyUSA | October 30–November 2 | 48% | 48% | Tied | 674 LV | ±3.9% |
| Polimetrix/YouGov | October 18–November 1 | 47% | 49% | 2 | 684 RV | Not reported |
| NBC News/Mason-Dixon Polling & Research | October 29–30 | 46% | 47% | 1 | 625 LV | ±4% |
| American Research Group | October 28–30 | 48% | 48% | Tied | 600 LV | ±4% |
| Politico/InsiderAdvantage | October 29 | 47% | 50% | 3 | 814 LV | ±3.4% |
| CNN/Time/Opinion Research Corporation | October 23–28 | 48% | 50% | 2 | 774 LV | ±3.5% |
| KCTV-TV Saint Louis/KMOX 1120 Radio St. Louis/SurveyUSA | October 25–26 | 48% | 48% | Tied | 672 LV | ±3.9% |
| Reuters/Zogby International | October 23–26 | 48.2% | 45.7% | 2.5 | 600 LV | ±4.1% |
| NBC News/Mason-Dixon Polling & Research | October 22–23 | 45% | 46% | 1 | 625 LV | ±4% |
| Zogby Interactive | October 17–20 | 48% | 48.3% | 0.3 | 717 LV | ±3.7% |
| Rasmussen Reports/Pulse Opinion Research | October 15 | 52% | 46% | 6 | 700 LV | ±4% |
| CNN/Time/Opinion Research Corporation | October 11–14 | 48% | 49% | 1 | 763 LV | ±3.5% |
| KCTV-TV Saint Louis/KMOX 1120 Radio St. Louis/SurveyUSA | October 11–12 | 51% | 43% | 8 | 546 LV | ±4.3% |
| Public Policy Polling | October 11–12 | 48% | 46% | 2 | 1,009 LV | ±3.1% |
| American Research Group | October 4–6 | 46% | 49% | 3 | 600 LV | ±4% |
| CNN/Time/Opinion Research Corporation | September 28–30 | 49% | 48% | 1 | 744 LV | ±3.5% |
| KCTV-TV Kansas City/SurveyUSA | September 23–24 | 46% | 48% | 2 | 705 LV | ±3.8% |
| American Research Group | September 11–15 | 45% | 50% | 5 | 600 LV | ±4% |
| Zogby Interactive | September 9–12 | 42.4% | 48.5% | 6.1 | 604 LV | ±4.1% |
| Rasmussen Reports/Pulse Opinion Research | September 11 | 46% | 51% | 5 | 700 LV | ±4% |
| CNN/Time/Opinion Research Corporation | September 7–9 | 45% | 50% | 5 | 940 RV | ±3% |
| Public Policy Polling | August 13–17 | 40% | 50% | 10 | 750 LV | ±3.6% |
| Rasmussen Reports/Pulse Opinion Research | August 7 | 44% | 50% | 6 | 500 LV | ±4.5% |
| KCTV-TV Kansas City/KSDK-TV Saint Louis/SurveyUSA | July 29–31 | 44% | 49% | 5 | 1,459 LV | ±2.6% |
| Rasmussen Reports/Pulse Opinion Research | July 7 | 45% | 50% | 5 | 500 LV | ±4.5% |
| Public Policy Polling | July 2–5 | 44% | 47% | 3 | 723 LV | ±3.6% |
| KCTV-TV Kansas City/KSDK-TV Saint Louis/SurveyUSA | June 20–22 | 43% | 50% | 7 | 543 LV | ±4.3% |
| Rasmussen Reports/Pulse Opinion Research | June 3 | 43% | 42% | 1 | 500 LV | ±4% |
| KCTV-TV Kansas City/KSDK-TV Saint Louis/SurveyUSA | May 16–18 | 45% | 48% | 3 | 1,523 LV | ±2.6% |
| Rasmussen Reports/Pulse Opinion Research | May 6 | 41% | 47% | 6 | 500 LV | ±4% |
| KCTV-TV Kansas City/SurveyUSA | April 11–13 | 42% | 50% | 8 | 542 RV | ±4.3% |
| Rasmussen Reports/Pulse Opinion Research | March 24 | 38% | 53% | 15 | 500 LV | ±4.5% |
| KCTV-TV Kansas City/SurveyUSA | March 14–16 | 39% | 53% | 14 | 536 RV | ±4.3% |
| SurveyUSA | February 26–28 | 42% | 48% | 6 | 632 RV | ±4% |
| KCTV-TV Kansas City/SurveyUSA | February 15–17 | 49% | 43% | 6 | 544 RV | ±4.3% |
| Rasmussen Reports/Pulse Opinion Research | February 12 | 40% | 42% | 2 | 500 LV | ±4.5% |
| KCTV-TV Kansas City/SurveyUSA | January 11–13 | 40% | 51% | 11 | 562 RV | ±4.2% |
| KCTV-TV Kansas City/SurveyUSA | December 13–15, 2007 | 47% | 44% | 3 | 547 RV | ±4.3% |
| KCTV-TV Kansas City/SurveyUSA | November 9–11, 2007 | 46% | 45% | 1 | 543 RV | ±4.3% |
| SurveyUSA | March 9–11, 2007 | 46% | 43% | 3 | Not reported | Not reported |
| SurveyUSA | February 9–11, 2007 | 45% | 48% | 3 | Not reported | Not reported |
| SurveyUSA | January 12–14, 2007 | 45% | 47% | 2 | 515 RV | ±4.4% |
Four-way race
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Bob Barr | Ralph Nader | Margin | Sample size | Margin of error |
| Zogby Interactive | June 11–30 | 42% | 40% | 6% | 1% | 2 | 1,121 LV | ±3.0% |
Five-way race
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Bob Barr | Ralph Nader | Cynthia McKinney | Margin | Sample size | Margin of error |
| Fox News/Rasmussen Reports/Pulse Opinion Research | November 2 | 49% | 49% | 0% | 0% | 0% | Tied | 1,000 LV | ±3% |
| Fox News/Rasmussen Reports/Pulse Opinion Research | October 26 | 48% | 47% | 1% | 2% | 0% | 1 | 1,000 LV | ±3% |
| Fox News/Rasmussen Reports/Pulse Opinion Research | October 19 | 49% | 44% | 1% | 2% | 1% | 5 | 1,000 LV | ±3% |
| Fox News/Rasmussen Reports/Pulse Opinion Research | October 12 | 50% | 47% | 0% | 1% | 0% | 3 | 1,000 LV | ±3% |
| Fox News/Rasmussen Reports/Pulse Opinion Research | October 5 | 50% | 47% | 1% | 1% | 0% | 3 | 1,000 LV | ±3% |
Six-way race
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Bob Barr | Ralph Nader | Cynthia McKinney | Chuck Baldwin | Margin | Sample size | Margin of error |
| Suffolk University | October 17–19 | 44% | 45% | 0% | 1% | 0% | 0% | 1 | 600 LV | ±4% |

### Montana

3 electoral votes (Republican in 2000 & 2004)
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Margin | Sample size | Margin of error |
| Polimetrix/YouGov | October 18–November 1 | 44% | 54% | 10 | 368 RV | Not reported |
| American Research Group | October 28–30 | 46% | 49% | 3 | 600 LV | ±4% |
| Rasmussen Reports/Pulse Opinion Research | October 29 | 46% | 50% | 4 | 500 LV | ±4.5% |
| NBC News/Mason-Dixon Polling & Research | October 23–25 | 44% | 48% | 4 | 625 LV | ±4% |
| American Research Group | October 6–8 | 45% | 50% | 5 | 600 LV | ±4% |
| Rasmussen Reports/Pulse Opinion Research | October 1 | 44% | 52% | 8 | 500 LV | ±4.5% |
| CNN/Time/Opinion Research Corporation | September 21–23 | 43% | 54% | 11 | 737 LV | ±3.5% |
| American Research Group | September 7–9 | 47% | 49% | 2 | 600 LV | ±4% |
| Rasmussen Reports/Pulse Opinion Research | September 8 | 42% | 53% | 11 | 700 LV | ±4% |
| Rasmussen Reports/Pulse Opinion Research | July 29 | 47% | 47% | Tied | 500 LV | ±4.5% |
| | July 1 | 48% | 43% | 5 | 500 LV | ±4.5% |
| Lee Newspapers/Mason-Dixon Polling & Research | May 19–21 | 39% | 47% | 8 | 625 LV | ±4% |
| Rasmussen Reports/Pulse Opinion Research | April 6 | 43% | 48% | 5 | 500 LV | ±4.5% |
| SurveyUSA | February 26–28 | 39% | 47% | 8 | 640 RV | ±4% |
Three-way race
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Ron Paul‡ | Margin | Sample size | Margin of error |
| Public Policy Polling | October 31–November 2 | 48% | 47% | 4% | 1 | 2,734 LV | ±1.9% |
Five-way race
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Ron Paul | Bob Barr | Ralph Nader | Margin | Sample size | Margin of error |
| Montana State University Billings | October 16–20 | 44.4% | 40.2% | 4.2% | 1% | 0.7% | 4.2% | 403 LV | ±5% |
‡ Ron Paul replaced Chuck Baldwin on the ballot in Montana.

### Nebraska

5 electoral votes (Republican in 2000 & 2004)
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Margin | Sample size | Margin of error |
| Polimetrix/YouGov | October 18–November 1 | 38% | 57% | 19 | 407 RV | Not reported |
| Rasmussen Reports/Pulse Opinion Research | September 30 | 37% | 56% | 19 | 500 LV | ±4.5% |
| American Research Group | September 12–17 | 34% | 60% | 26 | 600 LV | ±4% |
| Rasmussen Reports/Pulse Opinion Research | July 28 | 36% | 55% | 19 | 500 LV | ±4.5% |
| Rasmussen Reports/Pulse Opinion Research | June 23 | 36% | 52% | 16 | 500 LV | ±4.5% |
| SurveyUSA | May 16–18 | 40% | 49% | 9 | 600 RV | ±4.1% |
| Rasmussen Reports/Pulse Opinion Research | May 15 | 39% | 50% | 11 | 500 LV | ±4.5% |
| SurveyUSA | February 26–28 | 42% | 45% | 3 | 623 RV | ±4% |
Second congressional district
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Margin | Sample size | Margin of error |
| Anzalone Liszt Research | October 13–15 | 44% | 48% | 4 | 400 LV | ±4.9% |
| Anzalone Liszt Research | July 27–August 2 | 42% | 46% | 4 | 600 LV | ±4% |

### Nevada

5 electoral votes (Republican in 2000 & 2004)
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Margin | Sample size | Margin of error |
| American Research Group | October 31–November 3 | 51% | 46% | 5 | 600 LV | ±4% |
| Reuters/Zogby International | October 31–November 3 | 53.2% | 42.4% | 10.8 | 600 LV | ±4.1% |
| Public Policy Polling | October 31–November 2 | 51% | 47% | 4 | 1,243 LV | ±2.8% |
| Polimetrix/YouGov | October 18–November 1 | 51% | 46% | 5 | 494 RV | Not reported |
| Las Vegas Review-Journal/Mason-Dixon Polling & Research | October 28–29 | 47% | 43% | 4 | 625 LV | ±4% |
| CNN/Time/Opinion Research Corporation | October 23–28 | 52% | 45% | 7 | 684 LV | ±4% |
| Rasmussen Reports/Pulse Opinion Research | October 27 | 50% | 46% | 4 | 700 LV | ±4% |
| Reuters/Zogby International | October 23–26 | 48.2% | 44% | 4.2 | 601 LV | ±4.1% |
| Associated Press/Roper/GfK Group | October 22–26 | 52% | 41% | 11 | 628 LV | ±3.9% |
| CNN/Time/Opinion Research Corporation | October 19–21 | 51% | 46% | 5 | 700 LV | ±3.5% |
| Zogby Interactive | October 17–20 | 44% | 51.5% | 7.5 | 670 LV | ±3.9% |
| Politico/InsiderAdvantage | October 19 | 47% | 47% | Tied | 690 LV | ±3.6% |
| Rasmussen Reports/Pulse Opinion Research | October 16 | 50% | 45% | 5 | 700 LV | ±4% |
| Poll Position/InsiderAdvantage | October 13 | 49% | 46% | 3 | 506 LV | ±4% |
| Zogby Interactive | October 9–13 | 47.5% | 47.1% | 0.4 | 656 LV | ±3.9% |
| Las Vegas Review-Journal/Mason-Dixon Polling & Research | October 8–9 | 47% | 45% | 2 | 625 LV | ±4% |
| Poll Position/InsiderAdvantage | October 6 | 49% | 47% | 2 | 468 LV | ±5% |
| Rasmussen Reports/Pulse Opinion Research | October 2 | 51% | 47% | 4 | 700 LV | ±4% |
| Poll Position/Insider Advantage | September 30 | 48% | 47% | 1 | 437 LV | ±5% |
| CNN/Time/Opinion Research Corporation | September 28–30 | 51% | 47% | 4 | 684 LV | ±3.5% |
| American Research Group | September 27–29 | 47% | 49% | 2 | 600 LV | ±4% |
| Project New West/Myers Research/Myers Research/Grove Insight (D) | September 14–19 | 47% | 45% | 2 | 600 LV | ±4% |
| American Research Group | September 12–14 | 46% | 49% | 3 | 600 LV | ±4% |
| Zogby Interactive | September 9–12 | 42.5% | 50.1% | 7.6 | 572 LV | ±4.2% |
| Rasmussen Reports/Pulse Opinion Research | September 11 | 46% | 49% | 3 | 700 LV | ±4% |
| Poll Position/InsiderAdvantage | September 10 | 45% | 46% | 1 | 518 LV | ±4.2% |
| CNN/Time/Opinion Research Corporation | August 24–26 | 49% | 44% | 5 | 625 RV | ±4% |
| Las Vegas Review-Journal/Mason-Dixon Polling & Research | August 13–15 | 39% | 46% | 7 | 400 LV | ±5% |
| Rasmussen Reports/Pulse Opinion Research | August 11 | 45% | 48% | 3 | 700 LV | ±4.5% |
| Rasmussen Reports/Pulse Opinion Research | July 16 | 47% | 45% | 2 | 500 LV | ±4.5% |
| | June 18 | 42% | 45% | 3 | 500 LV | ±4.5% |
| Las Vegas Review-Journal/Mason-Dixon Polling & Research | June 9–11 | 42% | 44% | 2 | 625 LV | ±4% |
| Rasmussen Reports/Pulse Opinion Research | May 20 | 40% | 46% | 6 | 500 LV | ±4% |
| Rasmussen Reports/Pulse Opinion Research | April 21 | 43% | 48% | 5 | 500 LV | ±4% |
| Rasmussen Reports/Pulse Opinion Research | March 19 | 45% | 41% | 4 | 500 LV | ±4.5% |
| SurveyUSA | February 26–28 | 46% | 41% | 5 | 611 RV | ±4% |
| Rasmussen Reports/Pulse Opinion Research | February 12 | 50% | 38% | 12 | 500 LV | ±4% |
| Las Vegas Review-Journal/Mason-Dixon Polling & Research | December 3–5, 2007 | 39% | 46% | 7 | 625 LV | ±4% |
Four-way race
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Bob Barr | Ralph Nader | Margin | Sample size | Margin of error |
| Zogby Interactive | August 15–19 | 39% | 38% | 10% | 3% | 1 | 506 LV | ±4.4% |
| Zogby Interactive | June 11–30 | 38% | 38% | 9% | 2% | Tied | 584 LV | ±4.1% |
Five-way race
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Bob Barr | Ralph Nader | Cynthia McKinney | Margin | Sample size | Margin of error |
| Suffolk University | October 26 | 50% | 40% | 2% | 1% | 1% | 10 | 450 LV | ±4.6% |
| Suffolk University | September 17–21 | 45% | 46% | 1% | 2% | 0% | 1 | 600 LV | ±4% |
| CNN/Time/Opinion Research Corporation | August 24–26 | 41% | 41% | 5% | 6% | 3% | Tied | 625 RV | ±4% |
Six-way race
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Bob Barr | Ralph Nader | Cynthia McKinney | Chuck Baldwin | Margin | Sample size | Margin of error |
| Associated Press/Roper/GfK Group | October 22–26 | 52% | 40% | 1% | 1% | 0% | 1% | 12 | 628 LV | ±3.9% |

### New Hampshire

4 electoral votes (Republican in 2000) (Democrat in 2004)
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Margin | Sample size | Margin of error |
| WMUR/University of New Hampshire (Daily Tracking) | October 31–November 2 | 53% | 42% | 11 | 831 LV | ±3.4% |
| Polimetrix/YouGov | October 18–November 1 | 54% | 40% | 14 | 516 RV | Not reported |
| Rasmussen Reports/Pulse Opinion Research | October 30 | 51% | 44% | 7 | 700 LV | ±4% |
| WBZ-TV Boston/SurveyUSA | October 29–30 | 53% | 42% | 11 | 682 LV | ±3.8% |
| American Research Group | October 28–30 | 56% | 41% | 15 | 600 LV | ±4% |
| WMUR/University of New Hampshire (Daily Tracking) | October 25–27 | 58% | 33% | 25 | 652 LV | ±3.8% |
| Associated Press/Roper/GfK Group | October 22–26 | 55% | 37% | 18 | 600 LV | ±4.0% |
| NBC News/Mason-Dixon Polling & Research | October 23–25 | 50% | 39% | 11 | 625 LV | ±4% |
| Rasmussen Reports/Pulse Opinion Research | October 23 | 50% | 46% | 4 | 700 LV | ±4% |
| Marist College | October 22–23 | 50% | 45% | 5 | 655 LV | ±4% |
| Boston Globe/University of New Hampshire | October 18–22 | 54% | 39% | 15 | 725 LV | ±3.5% |
| Zogby Interactive | October 17–20 | 46.5% | 46.2% | 0.3 | 466 LV | ±4.6% |
| Zogby Interactive | October 9–13 | 47.7% | 42.6% | 5.1 | 455 LV | ±4.7% |
| American Research Group | October 6–8 | 52% | 43% | 9 | 600 LV | ±4% |
| CNN/Time/Opinion Research Corporation | October 3–6 | 53% | 45% | 8 | 813 LV | ±3.5% |
| WBZ-TV Boston/SurveyUSA | October 4–5 | 53% | 40% | 13 | 647 LV | ±3.9% |
| Rasmussen Reports/Pulse Opinion Research | October 1 | 52% | 43% | 10 | 700 LV | ±4% |
| Saint Anselm College/Schulman, Ronca, & Bucuvalas Inc. (SRBI) | September 25–30 | 49% | 37% | 12 | 835 LV | ±3.5% |
| Rasmussen Reports/Pulse Opinion Research | September 23 | 47% | 49% | 2 | 700 LV | ±4% |
| Allstate/National Journal/Financial Dynamics | September 18–22 | 44% | 43% | 1 | 403 RV | ±4.9% |
| Marist College | September 17–21 | 51% | 45% | 6 | 604 LV | ±4% |
| University of New Hampshire | September 14–21 | 45% | 47% | 2 | 523 LV | ±4.3% |
| American Research Group | September 15–18 | 45% | 48% | 3 | 600 LV | ±4% |
| Zogby Interactive | September 9–12 | 42.8% | 49.1% | 6.3 | 433 LV | ±4.8% |
| CNN/Time/Opinion Research Corporation | September 7–9 | 51% | 45% | 6 | 899 RV | ±3% |
| American Research Group | August 18–20 | 46% | 45% | 1 | 600 LV | ±4% |
| Rasmussen Reports/Pulse Opinion Research | August 18 | 47% | 46% | 1 | 700 LV | ±4% |
| | July 23 | 49% | 45% | 4 | 700 LV | ±4% |
| American Research Group | July 19–21 | 47% | 45% | 2 | 600 LV | ±4% |
| University of New Hampshire | July 11–20 | 46% | 43% | 3 | 475 LV | ±4.5% |
| Rasmussen Reports/Pulse Opinion Research | June 18 | 50% | 39% | 11 | 500 LV | ±4.5% |
| American Research Group | June 13–17 | 51% | 39% | 12 | 600 LV | ±4% |
| Rasmussen Reports/Pulse Opinion Research | May 21 | 48% | 43% | 5 | 500 LV | ±4.5% |
| Dartmouth College | April 30–May 2 | 39.3% | 41.8% | 2.5 | 401 RV | ±5.0% |
| Rasmussen Reports/Pulse Opinion Research | April 30 | 41% | 51% | 10 | 500 LV | ±4.5% |
| University of New Hampshire | April 25–30 | 43% | 49% | 6 | 456 LV | ±4.6% |
| Rasmussen Reports/Pulse Opinion Research | March 16 | 43% | 46% | 3 | 500 LV | ±4.5% |
| SurveyUSA | February 26–28 | 46% | 44% | 2 | 636 RV | ±4% |
| Rasmussen Reports/Pulse Opinion Research | February 11 | 49% | 36% | 13 | 500 LV | ±4.5% |
| Suffolk University | June 20–24, 2007 | 39% | 44% | 5 | 500 LV | ±4.4% |
| Suffolk University | February 24–28, 2007 | 42% | 42% | Tied | 500 LV | ±4.4% |
Four-way race
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Bob Barr | Ralph Nader | Margin | Sample size | Margin of error |
| Zogby Interactive | August 15–19 | 38% | 42% | 11% | 1% | 4 | 366 LV | ±5.1% |
| Zogby Interactive | June 11–30 | 40% | 37% | 10% | 2% | 3 | 436 LV | ±4.8% |
Five-way race
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Bob Barr | Ralph Nader | Cynthia McKinney | George Phillies | Margin | Sample size | Margin of error |
| Suffolk University | October 27–29 | 53% | 40% | 1% | 1% | 0% | N/A | 13 | 600 LV | ±4% |
| Associated Press/Roper/GfK Group | October 22–26 | 55% | 37% | 0% | 1% | N/A | 0% | 18 | 600 LV | ±4.0% |
| 7News/Suffolk University | September 20–24 | 46% | 45% | 1% | 1% | 0% | N/A | 1 | 600 LV | ±4% |

### New Jersey

15 electoral votes (Democrat in 2000 & 2004)
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Margin | Sample size | Margin of error |
| Rasmussen Reports/Pulse Opinion Research | November 2 | 57% | 40% | 17 | 500 LV | ±4.5% |
| Polimetrix/YouGov | October 18–November 1 | 55% | 40% | 15 | 777 RV | Not reported |
| Gannett/Monmouth University | October 29–31 | 55% | 34% | 21 | 801 LV | ±3.5% |
| WABC-TV New York/WCAU-TV Philadelphia/SurveyUSA | October 29–30 | 52% | 42% | 10 | 632 LV | ±4% |
| Fairleigh Dickinson University (PublicMind) | October 23–29 | 53% | 35% | 18 | 852 LV | ±3.5% |
| Marist College | October 20–21 | 56% | 39% | 17 | 628 LV | ±4% |
| Quinnipiac University | October 16–19 | 59% | 36% | 23 | 1,184 LV | ±2.9% |
| Gannett/Monmouth University | October 15–18 | 55% | 38% | 17 | 723 LV | ±3.7% |
| WABC-TV New York/WCAU-TV Philadelphia/SurveyUSA | October 11–12 | 55% | 40% | 15 | 551 LV | ±4.2% |
| Rasmussen Reports/Pulse Opinion Research | October 7 | 50% | 42% | 8 | 500 LV | ±4.5% |
| Fairleigh Dickinson University (PublicMind) | September 29–October 5 | 50% | 37% | 13 | 790 LV | ±3.5% |
| WABC-TV New York/WCAU-TV Philadelphia/SurveyUSA | September 27–28 | 52% | 42% | 10 | 611 LV | ±4% |
| American Research Group | September 19–21 | 51% | 42% | 9 | 600 LV | ±4% |
| Rasmussen Reports/Pulse Opinion Research | September 16 | 55% | 42% | 13 | 500 LV | ±4.5% |
| Gannett/Monmouth University | September 11–14 | 49% | 41% | 8 | 589 LV | ±4.0% |
| Quinnipiac University | September 10–14 | 48% | 45% | 3 | 1,187 LV | ±2.8% |
| Marist College | September 5–8 | 48% | 45% | 3 | 584 LV | ±4% |
| Fairleigh Dickinson University (PublicMind) | September 4–7 | 47% | 41% | 6 | 872 LV | ±3.5% |
| Quinnipiac University | August 4–10 | 51% | 41% | 10 | 1,468 LV | ±2.6% |
| Rasmussen Reports/Pulse Opinion Research | August 4 | 52% | 42% | 10 | 500 LV | ±4.5% |
| Gannett/Monmouth University | July 17–21 | 50% | 36% | 14 | 698 LV | ±3.7% |
| Rasmussen Reports/Pulse Opinion Research | July 7 | 47% | 44% | 3 | 500 LV | ±4.5% |
| Fairleigh Dickinson University (PublicMind) | June 17–23 | 49% | 33% | 16 | 702 RV | ±4% |
| Quinnipiac University | June 5–8 | 45% | 39% | 6 | 1,473 LV | ±2.6% |
| Rasmussen Reports/Pulse Opinion Research | June 4 | 48% | 39% | 9 | 500 LV | ±4.5% |
| Gannett/Monmouth University | April 24–28 | 56% | 32% | 24 | 720 RV | ±3.7% |
| Fairleigh Dickinson University (PublicMind) | March 24–30 | 47% | 42% | 5 | 816 RV | ±3.5% |
| Rasmussen Reports/Pulse Opinion Research | March 27 | 45% | 46% | 1 | 500 LV | ±4% |
| SurveyUSA | February 26–28 | 43% | 43% | Tied | 627 RV | ±4% |
| Rasmussen Reports/Pulse Opinion Research | February 27 | 43% | 45% | 2 | 500 LV | ±4% |
| Fairleigh Dickinson University (PublicMind) | February 18–24 | 43% | 38% | 5 | 795 RV | ±3.5% |
| Quinnipiac University | February 13–18 | 46% | 39% | 7 | 1,803 RV | ±2.3% |
| Quinnipiac University | September 18–23, 2007 | 44% | 41% | 3 | 1,230 RV | ±2.8% |
| Quinnipiac University | June 26–July 2 | 44% | 40% | 4 | 1,604 RV | ±2.5% |
| Quinnipiac University | April 10–16, 2007 | 43% | 41% | 2 | 1,424 RV | ±2.6% |
| Quinnipiac University | February 20–25, 2007 | 45% | 41% | 4 | 1,302 RV | ±2.7% |
| Quinnipiac University | January 16–22, 2007 | 39% | 42% | 3 | 1,310 RV | ±2.7% |
Four-way race
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Bob Barr | Ralph Nader | Margin | Sample size | Margin of error |
| Zogby Interactive | June 11–30 | 49% | 36% | 3% | 2% | 13 | 1,220 LV | ±2.9% |

### New Mexico

5 electoral votes (Democrat in 2000) (Republican in 2004)
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Margin | Sample size | Margin of error |
| Polimetrix/YouGov | October 18–November 1 | 53% | 43% | 10 | 457 RV | Not reported |
| KOB-TV Albuquerque/SurveyUSA | October 30–31 | 52% | 45% | 7 | 664 LV | ±3.9% |
| Public Policy Polling | October 28–30 | 58% | 41% | 17 | 1,537 LV | ±2.5% |
| Albuquerque Journal/Research & Polling Inc. | October 28–30 | 51% | 43% | 8 | 659 LV | ±3.8% |
| Rasmussen Reports/Pulse Opinion Research | October 28 | 54% | 44% | 10 | 500 LV | ±4.5% |
| Zogby Interactive | October 17–20 | 46.1% | 45.5% | 0.6 | 534 LV | ±4.3% |
| Rasmussen Reports/Pulse Opinion Research | October 13 | 55% | 42% | 13 | 700 LV | ±4% |
| KOB-TV Albuquerque/SurveyUSA | October 12–13 | 52% | 45% | 7 | 568 LV | ±4.2% |
| Zogby Interactive | October 9–13 | 51.2% | 43.5% | 7.7 | 532 LV | ±4.3% |
| Rasmussen Reports/Pulse Opinion Research | October 1 | 49% | 44% | 5 | 700 LV | ±4% |
| KOB-TV Albuquerque/SurveyUSA | September 29–30 | 52% | 44% | 8 | 698 LV | ±3.8% |
| Public Policy Polling | September 17–19 | 53% | 42% | 11 | 1,037 LV | ±3.0% |
| American Research Group | September 14–16 | 51% | 44% | 7 | 600 LV | ±4% |
| KOB-TV Albuquerque/SurveyUSA | September 14–16 | 52% | 44% | 8 | 671 LV | ±3.9% |
| Allstate/National Journal/Financial Dynamics | September 11–15 | 49% | 42% | 7 | 400 RV | ±4.9% |
| Zogby Interactive | September 9–12 | 45.6% | 44.1% | 1.5 | 477 LV | ±4.6% |
| Rasmussen Reports/Pulse Opinion Research | September 8 | 47% | 49% | 2 | 700 LV | ±4% |
| CNN/Time/Opinion Research Corporation | August 24–26 | 53% | 40% | 13 | 659 RV | ±4% |
| Rasmussen Reports/Pulse Opinion Research | August 20 | 48% | 44% | 4 | 700 LV | ±4% |
| Las Vegas Review-Journal/Mason-Dixon Polling & Research | August 13–15 | 41% | 45% | 4 | 400 LV | ±5% |
| Rasmussen Reports/Pulse Opinion Research | July 24 | 49% | 43% | 6 | 700 LV | ±4% |
| | June 19 | 47% | 39% | 8 | 500 LV | ±4.5% |
| KOB-TV Albuquerque/SurveyUSA | June 17–19 | 49% | 46% | 3 | 539 LV | ±4.3% |
| KOB-TV Albuquerque/SurveyUSA | May 16–18 | 44% | 44% | Tied | 600 RV | ±4.1% |
| Rasmussen Reports/Pulse Opinion Research | May 14 | 50% | 41% | 9 | 500 LV | ±4% |
| KOB-TV Albuquerque/SurveyUSA | April 11–13 | 44% | 50% | 6 | 490 RV | ±4.5% |
| Rasmussen Reports/Pulse Opinion Research | April 8 | 45% | 42% | 3 | 500 LV | ±4.5% |
| KOB-TV Albuquerque/SurveyUSA | March 14–16 | 51% | 45% | 6 | 520 RV | ±4.4% |
| SurveyUSA | February 26–28 | 50% | 43% | 7 | 601 RV | ±4.1% |
| Rasmussen Reports/Pulse Opinion Research | February 18 | 44% | 44% | Tied | 500 LV | ±4.5% |
| KOB-TV Albuquerque/SurveyUSA | February 15–17 | 55% | 40% | 15 | 506 RV | ±4.4% |
| KOB-TV Albuquerque/SurveyUSA | January 20–21 | 41% | 50% | 9 | 501 RV | ±4.5% |
| KOB-TV Albuquerque/SurveyUSA | December 13–15, 2007 | 40% | 51% | 11 | 523 RV | ±4.4% |
| KOB-TV Albuquerque/SurveyUSA | November 9–11, 2007 | 40% | 50% | 10 | 506 RV | ±4.4% |
| SurveyUSA | March 9–11, 2007 | 39% | 50% | 11 | Not reported | Not reported |
| SurveyUSA | February 9–11, 2007 | 47% | 44% | 3 | Not reported | Not reported |
| KOB-TV Albuquerque/SurveyUSA | January 12–14, 2007 | 39% | 52% | 13 | 496 RV | ±4.5% |
Three-way race
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Ralph Nader | Margin | Sample size | Margin of error |
| Albuquerque Journal/Research & Polling Inc. | September 29–October 2 | 45% | 40% | 1% | 5 | 659 LV | ±3.8% |
Four-way race
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Bob Barr | Ralph Nader | Margin | Sample size | Margin of error |
| Zogby Interactive | August 15–19 | 46% | 37% | 5% | 1% | 9 | 495 LV | ±4.4% |
| Zogby Interactive | June 11–30 | 49% | 33% | 9% | 2% | 16 | 464 LV | ±4.6% |
Five-way race
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Bob Barr | Ralph Nader | Cynthia McKinney | Margin | Sample size | Margin of error |
| CNN/Time/Opinion Research Corporation | August 24–26 | 50% | 36% | 8% | 0% | 0% | 14 | 659 RV | ±4% |

### New York

31 electoral votes (Democrat in 2000 & 2004)
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Margin | Sample size | Margin of error |
| Polimetrix/YouGov | October 18–November 1 | 58% | 38% | 20 | 988 RV | Not reported |
| WABC-TV New York/WGRZ-TV Buffalo/WHEC-TV Rochester/WNYT-TV Albany/SurveyUSA | October 27–28 | 62% | 33% | 29 | 633 LV | ±3.8% |
| Marist College | October 21–22 | 65% | 29% | 36 | 527 LV | ±4.5% |
| Siena College | October 19–21 | 62% | 31% | 31 | 721 LV | ±3.6% |
| Rasmussen Reports/Pulse Opinion Research | October 14 | 57% | 37% | 20 | 500 LV | ±4.5% |
| WABC-TV New York/WGRZ-TV Buffalo/WHEC-TV Rochester/WNYT-TV Albany/SurveyUSA | October 11–12 | 61% | 34% | 27 | 547 LV | ±4.1% |
| Siena College | September 28–30 | 58% | 36% | 22 | 631 RV | ±3.9% |
| WABC-TV New York/WGRZ-TV Buffalo/WHEC-TV Rochester/WNYT-TV Albany/SurveyUSA | September 23–24 | 57% | 38% | 19 | 668 LV | ±3.8% |
| American Research Group | September 14–16 | 55% | 38% | 17 | 600 LV | ±4% |
| Rasmussen Reports/Pulse Opinion Research | September 15 | 55% | 42% | 13 | 500 LV | ±4.5% |
| Siena College | September 8–10 | 46% | 41% | 5 | 626 RV | ±3.9% |
| Siena College | August 11–14 | 47% | 39% | 8 | 627 RV | ±3.9% |
| Rasmussen Reports/Pulse Opinion Research | August 4 | 55% | 36% | 19 | 500 LV | ±4.5% |
| Quinnipiac University | July 31–August 4 | 57% | 36% | 21 | 1,353 LV | ±2.7% |
| Siena College | July 7–10 | 50% | 37% | 13 | 626 RV | ±3.9% |
| Rasmussen Reports/Pulse Opinion Research | June 30 | 60% | 29% | 31 | 500 LV | ±4.5% |
| WABC-TV New York/WHEC-TV Rochester/WNYT-TV Albany/SurveyUSA | June 25–27 | 57% | 37% | 20 | 531 LV | ±4.3% |
| Siena College | June 9–11 | 51% | 33% | 18 | 624 RV | ±3.9% |
| New York Times | June 6–11 | 51% | 32% | 19 | 931 RV | Not reported |
| Quinnipiac University | June 3–8 | 50% | 36% | 14 | 1,388 RV | ±2.6% |
| Rasmussen Reports/Pulse Opinion Research | May 28 | 52% | 33% | 19 | 500 LV | ±4% |
| WABC-TV New York/WHEC-TV Rochester/WNYT-TV Albany/SurveyUSA | May 16–18 | 48% | 38% | 10 | 600 RV | ±4.1% |
| Siena College | May 12–15 | 49% | 38% | 11 | 622 RV | ±3.9% |
| Rasmussen Reports/Pulse Opinion Research | April 29 | 52% | 35% | 17 | 500 LV | ±4.5% |
| Siena College | April 13–16 | 45% | 40% | 5 | 624 RV | ±3.9% |
| WABC-TV New York/WHEC-TV Rochester/WNYT-TV Albany/SurveyUSA | April 11–13 | 52% | 43% | 9 | 499 RV | ±4.5% |
| WNBC News/Marist College | April 3–4 | 46% | 48% | 2 | 576 RV | ±4% |
| Quinnipiac University | March 16–18 | 49% | 38% | 11 | 1,528 RV | ±2.5% |
| WABC-TV New York/WHEC-TV Rochester/WNYT-TV Albany/SurveyUSA | March 14–16 | 52% | 44% | 8 | 507 RV | ±4.4% |
| Rasmussen Reports/Pulse Opinion Research | March 11 | 51% | 38% | 13 | 500 LV | ±4.5% |
| SurveyUSA | February 26–28 | 52% | 38% | 14 | 592 RV | ±4.1% |
| WABC-TV New York/WHEC-TV Rochester/WNYT-TV Albany/SurveyUSA | February 15–17 | 57% | 36% | 21 | 519 RV | ±4.3% |
| Siena College | February 11–14 | 47% | 40% | 7 | 633 RV | ±3.9% |
| WABC-TV New York/WHEC-TV Rochester/WNYT-TV Albany/SurveyUSA | January 20–21 | 49% | 43% | 6 | 516 RV | ±4.4% |
| Siena College | January 14–17 | 44% | 42% | 2 | 625 RV | ±3.9% |
| WABC-TV New York/WHEC-TV Rochester/WNYT-TV Albany/SurveyUSA | December 13–15, 2007 | 47% | 43% | 4 | 503 RV | ±4.5% |
| WABC-TV New York/WHEC-TV Rochester/WNYT-TV Albany/SurveyUSA | November 9–11, 2007 | 49% | 43% | 6 | 516 RV | ±4.4% |
| Quinnipiac University | September 24–30, 2007 | 47% | 39% | 8 | 1,504 RV | ±2.5% |
| Siena College | June 18–21, 2007 | 49% | 35% | 14 | 800 RV | ±3.5% |
| Quinnipiac University | June 12–17, 2007 | 48% | 33% | 15 | 1,369 RV | ±2.7% |
| Siena College | May 18–25, 2007 | 50% | 33% | 17 | 620 RV | ±3.9% |
| Siena College | April 16–20, 2007 | 50% | 37% | 13 | 980 RV | Not reported |
| NY1 News/Blum & Weprin Associates | April 4–7, 2007 | 50% | 35% | 15 | 1,013 RV | Not reported |
| Quinnipiac University | March 29–April 2, 2007 | 47% | 36% | 11 | 1,548 RV | ±2.5% |
| Siena College | March 19–22, 2007 | 47% | 39% | 8 | 622 RV | Not reported |
| SurveyUSA | March 9–11, 2007 | 48% | 43% | 5 | Not reported | Not reported |
| SurveyUSA | February 9–11, 2007 | 48% | 41% | 7 | Not reported | Not reported |
| Quinnipiac University | February 6–11, 2007 | 46% | 35% | 11 | 1,049 RV | ±3% |
| WABC-TV New York/WHEC-TV Rochester/WNYT-TV Albany/SurveyUSA | January 12–14, 2007 | 44% | 45% | 1 | 489 RV | ±4.5% |
Four-way race
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Bob Barr | Ralph Nader | Margin | Sample size | Margin of error |
| Siena College | July 17–29 | 44% | 26% | 2% | 3% | 18 | 671 RV | ±3.8% |
| Zogby Interactive | June 11–30 | 51% | 30% | 4% | 2% | 21 | 3,647 LV | ±1.7% |

### North Carolina

15 electoral votes (Republican in 2000 & 2004)
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Margin | Sample size | Margin of error |
| American Research Group | October 31–November 3 | 49% | 48% | 1 | 600 LV | ±4% |
| Reuters/Zogby International | October 31–November 3 | 49.1% | 49.5% | 0.4 | 600 LV | ±4.1% |
| WTVD-TV Raleigh/SurveyUSA | October 31–November 2 | 48% | 49% | 1 | 682 LV | ±3.8% |
| Polimetrix/YouGov | October 18–November 1 | 51% | 47% | 4 | 955 RV | Not reported |
| Elon University | October 27–30 | 44.6% | 38.3% | 6.3 | 797 LV | ±3.5% |
| Rasmussen Reports/Pulse Opinion Research | October 29 | 50% | 48% | 2 | 1,000 LV | ±3% |
| Politico/InsiderAdvantage | October 29 | 48% | 48% | Tied | 641 LV | ±3.7% |
| NBC News/Mason-Dixon Polling & Research | October 28–29 | 46% | 49% | 3 | 625 LV | ±4% |
| CNN/Time/Opinion Research Corporation | October 23–28 | 52% | 46% | 6 | 667 LV | ±4% |
| Allstate/National Journal/Financial Dynamics | October 23–27 | 47% | 43% | 4 | 402 RV | ±4.9% |
| Reuters/Zogby International | October 23–26 | 49.7% | 46.4% | 3.3 | 600 LV | ±4.1% |
| Associated Press/Roper/GfK Group | October 22–26 | 48% | 46% | 2 | 601 LV | ±4.0% |
| NBC News/Mason-Dixon Polling & Research | October 23–25 | 47% | 47% | Tied | 625 LV | ±4% |
| Rasmussen Reports/Pulse Opinion Research | October 23 | 48% | 50% | 2 | 700 LV | ±4% |
| WSOC-TV/Marshall Marketing & Communications | October 20–21 | 48.4% | 46.4% | 2 | 500 LV | ±4.5% |
| CNN/Time/Opinion Research Corporation | October 19–21 | 51% | 47% | 4 | 644 LV | ±4% |
| WTVD-TV Raleigh/SurveyUSA | October 18–20 | 47% | 47% | Tied | 627 LV | ±4% |
| Zogby Interactive | October 17–20 | 49.6% | 46.5% | 3.1 | 921 LV | ±3.3% |
| Politico/InsiderAdvantage | October 19 | 49% | 48% | 1 | 698 LV | ±3.6% |
| ETV/Winthrop University | September 28–October 19 | 44.6% | 44.2% | 0.4 | 744 LV | ±3.6% |
| Poll Position/InsiderAdvantage | October 13 | 48% | 46% | 2 | 474 LV | ±5% |
| Zogby Interactive | October 9–13 | 49.5% | 46.1% | 3.4 | 831 LV | ±3.5% |
| Rasmussen Reports/Pulse Opinion Research | October 8 | 49% | 48% | 1 | 700 LV | ±4% |
| WSOC-TV/Marshall Marketing & Communications | October 6–7 | 46% | 47.8% | 1.8 | 500 LV | ±4.5% |
| WTVD-TV Raleigh/SurveyUSA | October 5–6 | 46% | 49% | 3 | 617 LV | ±4% |
| CNN/Time/Opinion Research Corporation | October 3–6 | 49% | 49% | Tied | 666 LV | ±4% |
| Rasmussen Reports/Pulse Opinion Research | September 30 | 50% | 47% | 3 | 700 LV | ±4% |
| American Research Group | September 27–29 | 46% | 49% | 3 | 600 LV | ±4% |
| Rasmussen Reports/Pulse Opinion Research | September 23 | 49% | 47% | 2 | 500 LV | ±4.5% |
| Rasmussen Reports/Pulse Opinion Research | September 18 | 47% | 50% | 3 | 500 LV | ±4.5% |
| Elon University | September 15–16 | 35% | 41% | 6 | 411 A | ±4.9% |
| CNN/Time/Opinion Research Corporation | September 14–16 | 47% | 48% | 1 | 910 RV | ±3.5% |
| American Research Group | September 13–16 | 41% | 52% | 11 | 600 LV | ±4% |
| Zogby Interactive | September 9–12 | 48.1% | 46.6% | 1.5 | 635 LV | ±4.0% |
| WTVD-TV Raleigh/SurveyUSA | September 6–8 | 38% | 58% | 20 | 671 LV | ±3.8% |
| Garin-Hart-Yang Research Group (D) | September 5–7 | 46% | 49% | 3 | 605 LV | ±4% |
| Rasmussen Reports/Pulse Opinion Research | August 13 | 44% | 50% | 6 | 700 LV | ±4% |
| WTVD-TV Raleigh/SurveyUSA | August 9–11 | 45% | 49% | 4 | 655 LV | ±3.9% |
| Rasmussen Reports/Pulse Opinion Research | July 15 | 45% | 48% | 3 | 500 LV | ±4.5% |
| WTVD-TV Raleigh/SurveyUSA | July 12–14 | 45% | 50% | 5 | 676 LV | ±3.8% |
| Rasmussen Reports/Pulse Opinion Research | June 10 | 43% | 45% | 2 | 500 LV | ±4.5% |
| WTVD-TV Raleigh/SurveyUSA | May 17–19 | 43% | 51% | 8 | 713 LV | ±3.7% |
| Civitas Institute/Tel Opinion Research | May 14–17 | 39% | 44% | 5 | 800 RV | ±3.7% |
| Public Policy Polling | May 8–9 | 42% | 49% | 7 | 616 LV | ±4.0% |
| Rasmussen Reports/Pulse Opinion Research | May 8 | 45% | 48% | 3 | 500 LV | ±4.5% |
| Rasmussen Reports/Pulse Opinion Research | April 10 | 47% | 47% | Tied | 500 LV | ±4% |
| Civitas Institute/Tel Opinion Research | April 9–10 | 39% | 48% | 9 | 800 RV | ±3.7% |
| Rasmussen Reports/Pulse Opinion Research | March 20 | 42% | 51% | 9 | 500 LV | ±4.5% |
| SurveyUSA | February 26–28 | 45% | 47% | 2 | 630 RV | ±4% |
| Civitas Institute/Tel Opinion Research | February 19–22 | 36% | 46% | 10 | 800 RV | ±3.7% |
| Public Policy Polling | February 18 | 42% | 47% | 5 | 686 LV | ±3.7% |
| Public Policy Polling | January 21 | 38% | 52% | 14 | 762 LV | ±3.6% |
| Public Policy Polling | June 19, 2007 | 44% | 45% | 1 | 545 LV | ±4.15% |
Three-way race
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Bob Barr | Margin | Sample size | Margin of error |
| Fox News/Rasmussen Reports/Pulse Opinion Research | November 2 | 49% | 50% | 0% | 1 | 1,000 LV | ±3% |
| Public Policy Polling | October 30–November 2 | 50% | 49% | 1% | 1 | 2,100 LV | ±2.1% |
| Civitas Institute/Tel Opinion Research | October 27–29 | 47% | 46% | 3% | 1 | 600 LV | ±4.2% |
| CNN/Time/Opinion Research Corporation | October 23–28 | 52% | 46% | 2% | 6 | 667 LV | ±4% |
| | October 26 | 48% | 49% | 0% | 1 | 1,000 LV | ±3% |
| Public Policy Polling | October 25–26 | 49% | 48% | 1% | 1 | 1,038 LV | ±2.8% |
| CNN/Time/Opinion Research Corporation | October 19–21 | 51% | 46% | 2% | 5 | 644 LV | ±4% |
| Civitas Institute/Tel Opinion Research | October 18–20 | 48% | 45% | 1% | 3 | 600 LV | ±4.2% |
| Fox News/Rasmussen Reports/Pulse Opinion Research | October 19 | 51% | 48% | 0% | 3% | 1,000 LV | ±3% |
| Public Policy Polling | October 18–19 | 51% | 44% | 2% | 7 | 1,200 LV | ±2.8% |
| Fox News/Rasmussen Reports/Pulse Opinion Research | October 12 | 48% | 48% | 1% | Tied | 1,000 LV | ±3% |
| Public Policy Polling | October 11–12 | 49% | 46% | 1% | 3 | 1,196 LV | ±2.8% |
| Civitas Institute/Tel Opinion Research | October 6–8 | 48% | 43% | 2% | 5 | 600 LV | ±4.2% |
| Public Policy Polling | October 4–5 | 50% | 44% | 2% | 6 | 1,202 LV | ±2.8% |
| Public Policy Polling | September 28–29 | 47% | 45% | 3% | 2 | 1,041 LV | ±3.0% |
| Civitas Institute/Tel Opinion Research | September 17–20 | 45% | 45% | 1% | Tied | 600 LV | ±4.2% |
| Public Policy Polling | September 17–19 | 46% | 46% | 5% | Tied | 1,060 LV | ±3.0% |
| Civitas Institute/Tel Opinion Research | September 6–10 | 44% | 48% | 0% | 4 | 600 LV | ±4.2% |
| Public Policy Polling | September 9 | 44% | 48% | 4% | 4 | 626 LV | ±3.9% |
| Democracy Corps/Greenberg Quinlan Rosner (D) | August 20–26 | 44% | 47% | 4% | 3 | 852 LV | ±3.5% |
| Public Policy Polling | August 20–23 | 42% | 45% | 4% | 3 | 904 LV | ±3.3% |
| Civitas Institute/Tel Opinion Research | August 14–17 | 40% | 46% | 6% | 6 | 600 LV | ±4.2% |
| Public Policy Polling | July 23–27 | 44% | 47% | 3% | 3 | 823 LV | ±3.4% |
| Civitas Institute/Tel Opinion Research | July 14–16 | 40% | 43% | 2% | 3 | 600 LV | ±4% |
| Public Policy Polling | June 26–29 | 41% | 45% | 3% | 4 | 1,048 LV | ±3.0% |
| Civitas Institute/Tel Opinion Research | June 11–13 | 41% | 45% | 2% | 4 | 596 RV | ±4% |
| Public Policy Polling | May 28–29 | 40% | 43% | 6% | 3 | 543 LV | ±4.2% |
Four-way race
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Bob Barr | Ralph Nader | Margin | Sample size | Margin of error |
| Associated Press/Roper/GfK Group | October 22–26 | 48% | 46% | 0% | 0% | 2 | 601 LV | ±4.0% |
| Majority Opinion/InsiderAdvantage | August 19 | 42.8% | 44.5% | 5.2% | 0.9% | 1.7 | 614 LV | ±4% |
| Zogby Interactive | August 15–19 | 47% | 39% | 3% | 2% | 8 | 604 LV | ±4.0% |
| Zogby Interactive | June 11–30 | 47% | 38% | 4% | 1% | 9 | 1,340 LV | ±2.7% |

### North Dakota

3 electoral votes (Republican in 2000 & 2004)
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Margin | Sample size | Margin of error |
| Polimetrix/YouGov | October 18–November 1 | 43% | 50% | 7 | 271 RV | Not reported |
| North Dakota United Transportation Union/DFM Research (D) | October 13–14 | 44% | 41% | 3 | 504 RV | ±4.4% |
| Fargo Forum/Minnesota State University Moorhead | October 6–8 | 45% | 43% | 2 | 606 LV | ±4% |
| American Research Group | September 15–17 | 43% | 52% | 9 | 600 LV | ±4% |
| Rasmussen Reports/Pulse Opinion Research | September 8 | 41% | 55% | 14 | 500 LV | ±4.5% |
| North Dakota United Transportation Union/DFM Research (D) | August 23–27 | 43% | 40% | 3 | 400 RV | ±5% |
| Rasmussen Reports/Pulse Opinion Research | July 8 | 43% | 43% | Tied | 500 LV | ±4.5% |
| Dakota Wesleyan University | March 24–April 3 | 38% | 44% | 6 | 260 RV | ±6% |
| SurveyUSA | February 26–28 | 46% | 42% | 4 | 572 RV | ±4.2% |

### Ohio

20 electoral votes (Republican in 2000 & 2004)
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Margin | Sample size | Margin of error |
| Reuters/Zogby International | October 31–November 3 | 49.4% | 47.4% | 2 | 600 LV | ±4.1% |
| Public Policy Polling | October 31–November 2 | 50% | 48% | 2 | 1,208 LV | ±2.8% |
| WCMH-TV Columbus/WHIO-TV Dayton/WKYC-TV Cleveland/SurveyUSA | October 30–November 2 | 48% | 46% | 2 | 660 LV | ±3.9% |
| Quinnipiac University | October 27–November 2 | 50% | 43% | 7 | 1,574 LV | ±2.5% |
| Polimetrix/YouGov | October 18–November 1 | 51% | 45% | 6 | 990 RV | Not reported |
| Columbus Dispatch | October 22–31 | 52% | 46% | 6 | 2,164 LV | ±2% |
| NBC News/Mason-Dixon Polling & Research | October 28–29 | 45% | 47% | 2 | 625 LV | ±4% |
| CNN/Time/Opinion Research Corporation | October 23–28 | 51% | 47% | 4 | 779 LV | ±3.5% |
| WCMH-TV Columbus/WHIO-TV Dayton/WKYC-TV Cleveland/SurveyUSA | October 26–27 | 49% | 45% | 4 | 648 LV | ±3.9% |
| Bloomberg/Los Angeles Times | October 24–27 | 49% | 40% | 9 | 644 LV | ±4% |
| Allstate/National Journal/Financial Dynamics | October 23–27 | 48% | 41% | 7 | 404 RV | ±4.9% |
| Marist College | October 24–26 | 48% | 45% | 3 | 661 LV | ±4% |
| Reuters/Zogby International | October 23–26 | 49.7% | 45.1% | 4.6 | 600 LV | ±4.1% |
| Quinnipiac University | October 22–26 | 51% | 42% | 9 | 1,425 LV | ±2.6% |
| Associated Press/Roper/GfK Group | October 22–26 | 48% | 42% | 6 | 607 LV | ±4.0% |
| Public Policy Polling | October 22–23 | 51% | 44% | 7 | 993 LV | ±3.1% |
| Ohio University | October 12–23 | 57% | 41% | 16 | 611 A | ±4% |
| Politico/InsiderAdvantage | October 22 | 52% | 42% | 10 | 408 LV | ±5% |
| Big Ten | October 19–22 | 52.5% | 41% | 11.5 | 564 LV | ±4.2% |
| CNN/Time/Opinion Research Corporation | October 19–21 | 50% | 46% | 4 | 737 LV | ±3.5% |
| Quinnipiac University | October 16–21 | 52% | 38% | 14 | 1,360 LV | ±2.7% |
| Zogby Interactive | October 17–20 | 46.5% | 49.3% | 2.8 | 991 LV | ±3.2% |
| University of Akron | September 24–October 19 | 44.6% | 40.9% | 3.7 | 1,213 RV | ±2.8% |
| NBC News/Mason-Dixon Polling & Research | October 16–17 | 45% | 46% | 1 | 625 LV | ±4% |
| Rasmussen Reports/Pulse Opinion Research | October 14 | 49% | 49% | Tied | 700 LV | ±4% |
| WCMH-TV Columbus/WHIO-TV Dayton/WKYC-TV Cleveland/SurveyUSA | October 12–13 | 50% | 45% | 5 | 575 LV | ±4.2% |
| Zogby Interactive | October 9–13 | 44.8% | 49.5% | 4.7 | 1,018 LV | ±3.1% |
| Poll Position/InsiderAdvantage | October 9 | 49% | 44% | 5 | 509 LV | ±4% |
| Marist College | October 5–8 | 49% | 45% | 4 | 771 LV | ±3.5% |
| American Research Group | October 4–7 | 48% | 45% | 3 | 600 LV | ±4% |
| CNN/Time/Opinion Research Corporation | October 3–6 | 50% | 47% | 3 | 749 LV | ±3.5% |
| Public Policy Polling | October 4–5 | 49% | 43% | 6 | 1,239 LV | ±2.8% |
| ABC News/Washington Post | October 3–5 | 51% | 45% | 6 | 772 LV | ±3.5% |
| Columbus Dispatch | September 24–October 3 | 49% | 42% | 7 | 2,262 LV | ±2% |
| Poll Position/InsiderAdvantage | September 29 | 47% | 45% | 2 | 512 LV | ±4% |
| WCMH-TV Columbus/WCPO-TV Cincinnati/WHIO-TV Dayton/WKYC-TV Cleveland/SurveyUSA | September 28–29 | 48% | 49% | 1 | 693 LV | ±3.8% |
| Quinnipiac University | September 27–29 | 50% | 42% | 8 | 825 LV | ±3.4% |
| Quinnipiac University | September 22–26 | 49% | 42% | 7 | 1,203 LV | ±2.8% |
| Rasmussen Reports/Pulse Opinion Research | September 23 | 46% | 47% | 1 | 700 LV | ±4% |
| Poll Position/InsiderAdvantage | September 22 | 46% | 46% | Tied | 545 LV | ±4.1% |
| Big Ten | September 14–17 | 45.6% | 45.1% | 0.5 | 619 RV | ±4% |
| CNN/Time/Opinion Research Corporation | September 14–16 | 49% | 47% | 2 | 913 RV | ±3% |
| Allstate/National Journal/Financial Dynamics | September 11–15 | 41% | 42% | 1 | 400 RV | ±4.9% |
| Marist College | September 11–15 | 47% | 45% | 2 | 565 LV | ±4.5% |
| Public Policy Polling | September 13–14 | 44% | 48% | 4 | 1,077 LV | ±3.0% |
| WCMH-TV Columbus/WCPO-TV Cincinnati/WHIO-TV Dayton/WKYC-TV Cleveland/SurveyUSA | September 12–14 | 45% | 49% | 4 | 692 LV | ±3.8% |
| American Research Group | September 10–13 | 44% | 50% | 6 | 600 LV | ±4% |
| Zogby Interactive | September 9–12 | 43.9% | 49.8% | 5.9 | 847 LV | ±3.4% |
| Poll Position/InsiderAdvantage | September 10 | 47% | 48% | 1 | 503 LV | ±4.3% |
| University of Cincinnati | September 5–10 | 44% | 48% | 4 | 775 LV | ±3.5% |
| Quinnipiac University | September 5–9 | 49% | 44% | 5 | 1,367 LV | ±2.7% |
| CNN/Time/Opinion Research Corporation | August 31–September 2 | 47% | 45% | 2 | 685 RV | ±3.5% |
| Quinnipiac University | August 17–24 | 44% | 43% | 1 | 1,234 LV | ±2.8% |
| Rasmussen Reports/Pulse Opinion Research | August 18 | 43% | 48% | 5 | 700 LV | ±4% |
| University of Akron | July 17–August 17 | 39.6% | 39.9% | 0.3 | 753 RV | ±3.6% |
| Public Policy Polling | August 12–14 | 45% | 45% | Tied | 950 LV | ±3.2% |
| Quinnipiac University | July 23–29 | 46% | 44% | 2 | 1,229 LV | ±2.8% |
| Rasmussen Reports/Pulse Opinion Research | July 21 | 42% | 52% | 10 | 500 LV | ±4.5% |
| Public Policy Polling | July 17–20 | 48% | 40% | 8 | 1,058 LV | ±3.0% |
| WCMH-TV Columbus/WCPO-TV Cincinnati/SurveyUSA | June 20–22 | 48% | 46% | 2 | 580 LV | ±4.2% |
| Rasmussen Reports/Pulse Opinion Research | June 17 | 43% | 44% | 1 | 500 LV | ±4.5% |
| Quinnipiac University | June 9–16 | 48% | 42% | 6 | 1,396 LV | ±2.6% |
| Public Policy Polling | June 14–15 | 50% | 39% | 11 | 733 LV | ±3.6% |
| Quinnipiac University | May 13–20 | 40% | 44% | 4 | 1,244 RV | ±2.8% |
| WCMH-TV Columbus/WCPO-TV Cincinnati/SurveyUSA | May 16–18 | 48% | 39% | 9 | 600 RV | ±4.1% |
| Rasmussen Reports/Pulse Opinion Research | May 15 | 44% | 45% | 1 | 500 LV | ±4.5% |
| Quinnipiac University | April 23–29 | 42% | 43% | 1 | 1,127 RV | ±2.9% |
| WCMH-TV Columbus/WCPO-TV Cincinnati/SurveyUSA | April 11–13 | 45% | 47% | 2 | 527 RV | ±4.4% |
| Rasmussen Reports/Pulse Opinion Research | April 8 | 40% | 47% | 7 | 500 LV | ±4.5% |
| Quinnipiac University | March 24–31 | 43% | 42% | 1 | 1,238 RV | ±2.8% |
| Public Policy Polling | March 15–17 | 41% | 49% | 8 | 621 LV | ±3.9% |
| WCMH-TV Columbus/WCPO-TV Cincinnati/SurveyUSA | March 14–16 | 43% | 50% | 7 | 532 RV | ±4.3% |
| Rasmussen Reports/Pulse Opinion Research | March 13 | 40% | 46% | 6 | 500 LV | ±4.5% |
| SurveyUSA | February 26–28 | 50% | 40% | 10 | 629 RV | ±4% |
| University of Cincinnati | February 21–24 | 48% | 47% | 1 | 970 RV | ±3% |
| Rasmussen Reports/Pulse Opinion Research | February 17 | 41% | 42% | 1 | 500 LV | ±4.5% |
| WCMH-TV Columbus/WCPO-TV Cincinnati/WHIO-TV Dayton/WKYC-TV Cleveland/SurveyUSA | February 15–17 | 47% | 44% | 3 | 542 RV | ±4.3% |
| Quinnipiac University | February 6–12 | 40% | 42% | 2 | 1,748 RV | ±2.3% |
| WCMH-TV Columbus/WCPO-TV Cincinnati/SurveyUSA | January 4–6 | 43% | 50% | 7 | 535 RV | ±4.3% |
| Public Policy Polling | January 4 | 42% | 45% | 3 | 946 LV | ±3.1% |
| WCPO-TV Cincinnati/WYTV-TV Youngstown/SurveyUSA | December 13–15, 2007 | 38% | 47% | 9 | 539 RV | ±4.3% |
| WCPO-TV Cincinnati/SurveyUSA | December 3, 2007 | 40% | 51% | 11 | 643 RV | ±3.9% |
| WCPO-TV Cincinnati/WYTV-TV Youngstown/SurveyUSA | November 9–11, 2007 | 37% | 52% | 15 | 533 RV | ±4.3% |
| Quinnipiac University | October 1–8, 2007 | 43% | 39% | 4 | 946 RV | ±3.2% |
| Quinnipiac University | August 28–September 3, 2007 | 41% | 42% | 1 | 1,430 RV | ±2.6% |
| Quinnipiac University | July 3–9, 2007 | 43% | 38% | 5 | 1,447 RV | ±2.6% |
| Quinnipiac University | June 18–25, 2007 | 43% | 38% | 5 | 1,013 RV | ±3.1% |
| Quinnipiac University | May 8–13, 2007 | 44% | 41% | 3 | 939 RV | ±3.2% |
| Quinnipiac University | April 17–24, 2007 | 36% | 42% | 6 | 1,083 RV | ±3% |
| Quinnipiac University | March 13–19, 2007 | 45% | 37% | 8 | 1,122 RV | ±2.9% |
| SurveyUSA | March 9–11, 2007 | 39% | 50% | 11 | Not reported | Not reported |
| Quinnipiac University | February 25–March 4, 2007 | 42% | 39% | 3 | 1,281 RV | ±2.7% |
| SurveyUSA | February 9–11, 2007 | 41% | 51% | 10 | Not reported | Not reported |
| Quinnipiac University | January 23–28, 2007 | 38% | 41% | 3 | 1,305 RV | ±2.7% |
| WCPO-TV Cincinnati/WYTV-TV Youngstown/SurveyUSA | January 12–14, 2007 | 40% | 54% | 14 | 510 RV | ±4.4% |
Four-way race
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Bob Barr | Ralph Nader | Margin | Sample size | Margin of error |
| Ohio News Organization/University of Cincinnati | October 4–8 | 46% | 48% | 1% | 2% | 2 | 876 LV | ±3% |
| Democracy Corps/Greenberg Quinlan Rosner (D) | September 29–October 1 | 49% | 43% | 2% | 2% | 6 | 600 LV | ±4% |
| Ohio News Organization/University of Cincinnati | September 12–16 | 42% | 48% | 1% | 4% | 6 | 869 LV | ±3.3% |
| Columbus Dispatch | August 12–21 | 41% | 42% | 1% | 1% | 1 | 2,102 LV | ±2.2% |
| Zogby Interactive | August 15–19 | 41% | 36% | 8% | 1% | 5 | 683 LV | ±3.8% |
| Zogby Interactive | June 11–30 | 43% | 38% | 7% | 2% | 5 | 2,172 LV | ±2.1% |
Five-way race
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Bob Barr | Ralph Nader | Cynthia McKinney | Margin | Sample size | Margin of error |
| Fox News/Rasmussen Reports/Pulse Opinion Research | November 2 | 49% | 49% | 0% | 1% | 0% | Tied | 1,000 LV | ±3% |
| CNN/Time/Opinion Research Corporation | October 23–28 | 50% | 43% | 1% | 3% | 0% | 7 | 779 LV | ±3.5% |
| Fox News/Rasmussen Reports/Pulse Opinion Research | October 26 | 49% | 45% | 1% | 0% | 0% | 4 | 1,000 LV | ±3% |
| Ohio News Organization/University of Cincinnati | October 18–22 | 49% | 46% | 1% | 2% | 0% | 3 | 886 LV | ±3.3% |
| CNN/Time/Opinion Research Corporation | October 19–21 | 49% | 44% | 2% | 3% | 0% | 5 | 737 LV | ±3.5% |
| Fox News/Rasmussen Reports/Pulse Opinion Research | October 19 | 47% | 49% | 0% | 1% | 0% | 2 | 1,000 LV | ±3% |
| Fox News/Rasmussen Reports/Pulse Opinion Research | October 12 | 49% | 47% | 0% | 1% | 0% | 2 | 1,000 LV | ±3% |
| Fox News/Rasmussen Reports/Pulse Opinion Research | October 5 | 47% | 48% | 1% | 1% | 0% | 1 | 1,000 LV | ±3% |
| Fox News/Rasmussen Reports/Pulse Opinion Research | September 28 | 47% | 48% | 0% | 0% | 0% | 1 | 500 LV | ±4.5% |
| Fox News/Rasmussen Reports/Pulse Opinion Research | September 21 | 46% | 50% | 1% | 1% | 0% | 4 | 500 LV | ±4.5% |
| Fox News/Rasmussen Reports/Pulse Opinion Research | September 14 | 45% | 48% | 0% | 1% | 0% | 4 | 500 LV | ±4.5% |
| Fox News/Rasmussen Reports/Pulse Opinion Research | September 7 | 44% | 51% | 0% | 1% | 0% | 7 | 500 LV | ±4% |
Seven-way race
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Bob Barr | Ralph Nader | Cynthia McKinney | Chuck Baldwin | Brian Moore | Margin | Sample size | Margin of error |
| Suffolk University | October 16–19 | 51% | 42% | 1% | 1% | 0% | 0% | 0% | 9 | 600 LV | ±4% |
| Suffolk University | September 10–13 | 42% | 46% | 1% | 1% | 1% | 0% | 0% | 4 | 600 LV | ±4% |
Eight-way race
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Bob Barr | Ralph Nader | Cynthia McKinney | Chuck Baldwin | Brian Moore | Richard Duncan | Margin | Sample size | Margin of error |
| Associated Press/Roper/GfK Group | October 22–26 | 48% | 41% | 0% | 0% | 0% | 0% | 0% | 0% | 7 | 607 LV | ±4.0% |

### Oklahoma

7 electoral votes (Republican in 2000 & 2004)
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Margin | Sample size | Margin of error |
| Polimetrix/YouGov | October 18–November 1 | 39% | 58% | 19 | 491 RV | Not reported |
| KFOR-TV Oklahoma City/SurveyUSA | October 28–29 | 34% | 63% | 29 | 594 LV | ±4% |
| Oklahoma City News9/SoonerPoll | October 24–26 | 34.8% | 61.6% | 26.8 | 720 LV | ±3.4% |
| KFOR-TV Oklahoma City/SurveyUSA | October 18–19 | 35% | 59% | 24 | 561 LV | ±4.2% |
| Oklahoma City News9/SoonerPoll | October 10–12 | 31.9% | 63% | 31.1 | 813 LV | ±3.44% |
| Oklahoma City News9/SoonerPoll | October 4–5 | 29.1% | 65.5% | 36.4 | 801 LV | ±3.46% |
| KFOR-TV Oklahoma City/SurveyUSA | September 28–29 | 34% | 64% | 30 | 656 LV | ±3.8% |
| Oklahoma City News9/SoonerPoll | September 26–28 | 26.5% | 67.6% | 41.6 | 904 LV | ±3.25% |
| Oklahoma City News9/SoonerPoll | September 20–22 | 26.2% | 65.8% | 39.6 | 667 LV | ±3.79% |
| American Research Group | September 15–18 | 34% | 61% | 27 | 600 LV | ±4% |
| Oklahoma City News9/SoonerPoll | September 14 | 26.9% | 69.1% | 42.2 | 859 LV | ±3.34% |
| Rasmussen Reports/Pulse Opinion Research | September 11 | 32% | 63% | 31 | 500 LV | ±4.5% |
| Oklahoma City News9/SoonerPoll | September 7 | 27.9% | 65.9% | 38 | 894 LV | ±3.27% |
| KFOR-TV Oklahoma City/SurveyUSA | September 5–7 | 35% | 62% | 27 | 652 LV | ±3.7% |
| Tulsa World/KOTV/SoonerPoll | July 19–23 | 24% | 56% | 32 | 750 LV | ±3.6% |
| Cole Hargrave Snodgrass & Associates | April 1–10 | 21% | 62% | 41 | 500 RV | ±4.3% |
| SurveyUSA | February 26–28 | 34% | 57% | 23 | 599 RV | ±4% |
| Tulsa World/KOTV/SoonerPoll | January 27–30 | 30% | 58% | 28 | 757 RV | ±3.56% |
| Tulsa World/KOTV/SoonerPoll | December 16–19, 2007 | 26% | 62% | 36 | 745 RV | ±3.59% |
Four-way race
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Bob Barr | Ralph Nader | Margin | Sample size | Margin of error |
| Zogby Interactive | June 11–30 | 37% | 42% | 9% | 2% | 5 | 406 LV | ±5.0% |

### Oregon

7 electoral votes (Democrat in 2000 & 2004)
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Margin | Sample size | Margin of error |
| Polimetrix/YouGov | October 18–November 1 | 54% | 43% | 11 | 698 RV | Not reported |
| Rasmussen Reports/Pulse Opinion Research | October 30 | 54% | 42% | 12 | 500 LV | ±4% |
| Public Policy Polling | October 28–30 | 57% | 42% | 15 | 1,424 LV | ±2.6% |
| Moore Information | October 27–28 | 51% | 37% | 14 | 400 RV | ±5% |
| KATU-TV Portland/SurveyUSA | October 25–26 | 57% | 38% | 19 | 672 LV | ±3.8% |
| Portland Tribune/Davis, Hibbitts & Midghall Inc. | October 23–25 | 53% | 34% | 19 | 500 RV | ±4.4% |
| Riley Research Associates | October 10–20 | 48% | 33% | 15 | 499 LV | ±4.4% |
| Rasmussen Reports/Pulse Opinion Research | October 14 | 54% | 41% | 13 | 500 LV | ±4.5% |
| KATU-TV Portland/SurveyUSA | October 11–12 | 57% | 40% | 17 | 584 LV | ±4.1% |
| Rasmussen Reports/Pulse Opinion Research | October 9 | 54% | 43% | 11 | 500 LV | ±4.5% |
| KATU-TV Portland/Roll Call/SurveyUSA | September 22–23 | 52% | 41% | 11 | 708 LV | ±3.8% |
| American Research Group | September 20–22 | 52% | 41% | 11 | 600 LV | ±4% |
| Rasmussen Reports/Pulse Opinion Research | September 15 | 51% | 47% | 4 | 500 LV | ±4.5% |
| Moore Information | September 10–11 | 43% | 37% | 6 | 408 RV | ±5% |
| Rasmussen Reports/Pulse Opinion Research | August 7 | 52% | 42% | 10 | 500 LV | ±4.5% |
| KATU-TV Portland/SurveyUSA | August 2–4 | 48% | 45% | 3 | 629 LV | ±4% |
| Rasmussen Reports/Pulse Opinion Research | July 15 | 49% | 40% | 9 | 500 LV | ±4.5% |
| KATU-TV Portland/SurveyUSA | June 17–19 | 48% | 45% | 3 | 547 LV | ±4.3% |
| Rasmussen Reports/Pulse Opinion Research | June 11 | 46% | 38% | 8 | 500 LV | ±4.5% |
| KATU-TV Portland/SurveyUSA | May 16–18 | 49% | 39% | 10 | 600 RV | ±4.1% |
| Rasmussen Reports/Pulse Opinion Research | May 7 | 52% | 38% | 14 | 500 LV | ±4.5% |
| KATU-TV Portland/SurveyUSA | April 11–13 | 51% | 42% | 9 | 543 RV | ±4.3% |
| Rasmussen Reports/Pulse Opinion Research | March 26 | 48% | 42% | 6 | 500 LV | ±4.5% |
| KATU-TV Portland/SurveyUSA | March 14–16 | 50% | 41% | 9 | 524 RV | ±4.4% |
| SurveyUSA | February 26–28 | 49% | 41% | 8 | 628 RV | ±4% |
| Riley Research Associates | February 7–18 | 46% | 38% | 8 | 401 LV | ±4.89% |
| KATU-TV Portland/SurveyUSA | February 15–17 | 48% | 47% | 1 | 530 RV | ±4.3% |
| Rasmussen Reports/Pulse Opinion Research | February 13 | 49% | 40% | 9 | 500 LV | ±4.5% |
| KATU-TV Portland/SurveyUSA | January 11–13 | 47% | 47% | Tied | 544 RV | ±4.3% |
| KATU-TV Portland/SurveyUSA | December 13–15, 2007 | 46% | 44% | 2 | 537 RV | ±4.3% |
| KATU-TV Portland/SurveyUSA | November 9–11, 2007 | 45% | 45% | Tied | 523 RV | ±4.4% |
| SurveyUSA | March 9–11, 2007 | 49% | 43% | 6 | Not reported | Not reported |
| SurveyUSA | February 9–11, 2007 | 43% | 47% | 4 | Not reported | Not reported |
| KATU-TV Portland/SurveyUSA | January 12–14, 2007 | 40% | 51% | 11 | 500 RV | ±4.5 |
Three-way race
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Ralph Nader | Margin | Sample size | Margin of error |
| Portland Tribune/Davis, Hibbitts & Midghall Inc. | September 11–14 | 50% | 40% | 2 | 10 | 500 RV | ±4.4% |
Four-way race
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Bob Barr | Ralph Nader | Margin | Sample size | Margin of error |
| Grove Insight (D) | October 7–9 | 52% | 39% | 1% | 1% | 13 | 600 LV | ±4% |
| Hoffman Research Group | September 8–9 | 46% | 39% | 1% | 1% | 7 | 600 LV | ±4% |
| Zogby Interactive | June 11–30 | 49% | 33% | 6% | 1% | 16 | 821 LV | ±3.5% |

### Pennsylvania

21 electoral votes (Democrat in 2000 & 2004)
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Margin | Sample size | Margin of error |
| Reuters/Zogby International | October 31–November 3 | 51.2% | 41.4% | 9.8 | 600 LV | ±4.1% |
| KDKA-TV Philadelphia/WCAU-TV Pittsburgh/WHTM-TV Harrisburg/WJAC-TV Johnstown-Altoona/WNEP-TV Wilkes-Barre Scranton/SurveyUSA | October 31–November 3 | 52% | 43% | 9 | 657 LV | ±3.9% |
| Public Policy Polling | October 31–November 2 | 53% | 45% | 8 | 1,529 LV | ±2.5% |
| Quinnipiac University | October 27–November 2 | 52% | 42% | 10 | 1,493 LV | ±2.5% |
| Rasmussen Reports/Pulse Opinion Research | November 1 | 52% | 46% | 6 | 700 LV | ±4% |
| Polimetrix/YouGov | October 18–November 1 | 51% | 44% | 7 | 1,009 RV | Not reported |
| American Research Group | October 29–31 | 51% | 45% | 6 | 600 LV | ±4% |
| KDKA-TV Philadelphia/WCAU-TV Pittsburgh/WHTM-TV Harrisburg/WJAC-TV Johnstown-Altoona/WNEP-TV Wilkes-Barre Scranton/SurveyUSA | October 29–31 | 51% | 44% | 7 | 700 LV | ±3.8% |
| Rasmussen Reports/Pulse Opinion Research | October 30 | 51% | 47% | 4 | 500 LV | ±4.5% |
| Morning Call/Muhlenberg College | October 26–30 | 53% | 43% | 10 | 615 LV | ±4.0% |
| NBC News/Mason-Dixon Polling & Research | October 27–28 | 47% | 43% | 4 | 625 LV | ±4% |
| CNN/Time/Opinion Research Corporation | October 23–28 | 55% | 43% | 12 | 768 LV | ±3.5% |
| Rasmussen Reports/Pulse Opinion Research | October 27 | 53% | 46% | 7 | 500 LV | ±4.5% |
| Marist College | October 26–27 | 55% | 41% | 14 | 713 LV | ±4% |
| Politico/InsiderAdvantage | October 26 | 51% | 42% | 9 | 588 LV | ±3.8% |
| Associated Press/Roper/GfK Group | October 22–26 | 53% | 40% | 13 | 607 LV | ±4.0% |
| Quinnipiac University | October 22–26 | 53% | 41% | 12 | 1,364 LV | ±2.7% |
| Franklin & Marshall College | October 21–26 | 51% | 39% | 12 | 545 LV | ±4.2% |
| Temple University | October 20–26 | 52% | 43% | 9 | 761 LV | ±3.6% |
| Morning Call/Muhlenberg College (Daily Tracking) | October 21–25 | 53% | 41% | 12 | 597 LV | ±4.0% |
| KDKA-TV Philadelphia/WCAU-TV Pittsburgh/WHTM-TV Harrisburg/WJAC-TV Johnstown-Altoona/WNEP-TV Wilkes-Barre Scranton/SurveyUSA | October 21–22 | 53% | 41% | 12 | 620 LV | ±4% |
| Big Ten | October 19–22 | 51.9% | 41.5% | 10.4 | 566 LV | ±4.2% |
| Quinnipiac University | October 16–21 | 53% | 40% | 13 | 1,425 LV | ±2.6% |
| Morning Call/Muhlenberg College (Daily Tracking) | October 16–20 | 52% | 42% | 10 | 600 LV | ±4.0% |
| Allstate/National Journal/Financial Dynamics | October 16–20 | 51% | 41% | 10 | 412 RV | ±4.9% |
| Susquehanna Polling & Research Inc. | October 16–18 | 48% | 40% | 8 | 700 LV | ±3.7% |
| Morning Call/Muhlenberg College (Daily Tracking) | October 11–15 | 53% | 37% | 16 | 595 LV | ±4.0% |
| KDKA-TV Philadelphia/WCAU-TV Pittsburgh/WHTM-TV Harrisburg/WJAC-TV Johnstown-Altoona/WNEP-TV Wilkes-Barre Scranton/SurveyUSA | October 11–13 | 55% | 40% | 15 | 516 LV | ±4.4% |
| Zogby Interactive | October 9–13 | 51.6% | 40.2% | 10.4 | 737 LV | ±3.7% |
| Morning Call/Muhlenberg College (Daily Tracking) | October 6–10 | 52% | 40% | 12 | Not reported | Not reported |
| Marist College | October 5–8 | 53% | 41% | 12 | 757 LV | ±3.5% |
| Rasmussen Reports/Pulse Opinion Research | October 6 | 54% | 41% | 13 | 700 LV | ±4% |
| KDKA-TV Philadelphia/WCAU-TV Pittsburgh/WHTM-TV Harrisburg/WJAC-TV Johnstown-Altoona/WNEP-TV Wilkes-Barre Scranton/SurveyUSA | October 5–6 | 55% | 40% | 15 | 653 LV | ±3.9% |
| WHYY-TV Philadelphia/West Chester University | October 3–6 | 52.3% | 42% | 10.3 | 506 RV | Not reported |
| Morning Call/Muhlenberg College (Daily Tracking) | October 1–5 | 49% | 38% | 11 | 601 LV | ±4.0% |
| Morning Call/Muhlenberg College (Daily Tracking) | September 26–30 | 48% | 41% | 7 | 598 LV | ±4.0% |
| Quinnipiac University | September 27–29 | 54% | 39% | 15 | 832 LV | ±3.4% |
| Franklin & Marshall College | September 23–28 | 45% | 38% | 7 | 767 RV | ±3.5% |
| Quinnipiac University | September 22–26 | 49% | 43% | 6 | 1,138 LV | ±2.9% |
| Morning Call/Muhlenberg College (Daily Tracking) | September 21–25 | 47% | 43% | 4 | 577 LV | ±4.5% |
| Rasmussen Reports/Pulse Opinion Research | September 24 | 49% | 45% | 4 | 700 LV | ±4% |
| KDKA-TV Philadelphia/WCAU-TV Pittsburgh/WHTM-TV Harrisburg/WJAC-TV Johnstown-Altoona/WNEP-TV Wilkes-Barre Scranton/SurveyUSA | September 23–24 | 50% | 44% | 6 | 1,094 LV | ±3% |
| CNN/Time/Opinion Research Group | September 21–23 | 53% | 44% | 9 | 730 LV | ±3.5% |
| American Research Group | September 19–22 | 50% | 46% | 4 | 600 LV | ±4% |
| Allstate/National Journal/Financial Dynamics | September 18–22 | 43% | 41% | 2 | 406 RV | ±4.9% |
| NBC News/Mason-Dixon Polling & Research | September 16–18 | 46% | 44% | 2 | 625 LV | ±4% |
| Big Ten | September 14–17 | 45% | 44.6% | 0.4 | 608 RV | ±4% |
| Marist College | September 11–15 | 49% | 44% | 5 | 535 LV | ±4.5% |
| Zogby Interactive | September 9–12 | 44.3% | 49.1% | 4.8 | 701 LV | ±3.8% |
| Quinnipiac University | September 5–9 | 48% | 45% | 3 | 1,001 LV | ±3.1% |
| CNN/Time/Opinion Research Corporation | August 24–26 | 48% | 43% | 5 | 669 RV | ±4% |
| Quinnipiac University | August 17–24 | 49% | 42% | 7 | 1,234 LV | ±2.8% |
| Rasmussen Reports/Pulse Opinion Research | August 19 | 48% | 45% | 3 | 700 LV | ±4% |
| Susquehanna Polling & Research Inc. | August 11–14 | 46% | 41% | 5 | 700 LV | ±3.7% |
| Franklin & Marshall College | August 4–10 | 46% | 41% | 5 | 641 RV | ±3.9% |
| Quinnipiac University | July 23–29 | 49% | 42% | 7 | 1,317 LV | ±2.7% |
| Rasmussen Reports/Pulse Opinion Research | July 23 | 51% | 45% | 6 | 700 LV | ±4% |
| Rasmussen Reports/Pulse Opinion Research | June 19, 22 | 46% | 42% | 4 | 1,000 LV | ±3% |
| Franklin & Marshall College | June 16–22 | 42% | 36% | 6 | 1,501 RV | ±2.5% |
| Quinnipiac University | June 9–16 | 52% | 40% | 12 | 1,511 RV | ±2.5% |
| Rasmussen Reports/Pulse Opinion Research | May 21 | 45% | 43% | 2 | 500 LV | ±4.5% |
| Quinnipiac University | May 13–20 | 46% | 40% | 6 | 1,667 RV | ±2.4% |
| WCAU-TV Philadelphia/SurveyUSA | May 16–18 | 48% | 40% | 8 | 600 RV | ±4.1% |
| Susquehanna Polling & Research Inc. | May 1–6 | 46% | 39% | 7 | 800 RV | ±3.4% |
| Quinnipiac University | April 23–29 | 47% | 38% | 9 | 1,494 RV | ±2.5% |
| Rasmussen Reports/Pulse Opinion Research | April 24 | 43% | 44% | 1 | 500 LV | ±4% |
| Rasmussen Reports/Pulse Opinion Research | April 9 | 47% | 39% | 8 | 500 LV | ±4.5% |
| Temple University | March 27–April 9 | 47% | 40% | 7 | 1,175 RV | ±3% |
| Quinnipiac University | March 24–31 | 43% | 39% | 4 | 3,484 RV | ±1.7% |
| Rasmussen Reports/Pulse Opinion Research | March 10 | 43% | 44% | 1 | 500 LV | ±4.5% |
| Triad Strategies/Susquehanna Polling & Research Inc. | March 5–10 | 41% | 45% | 4 | 700 RV | Not reported |
| SurveyUSA | February 26–28 | 42% | 47% | 5 | 608 RV | ±4.1% |
| Quinnipiac University | February 21–25 | 42% | 40% | 2 | 1,872 RV | ±2.3% |
| Franklin & Marshall College | February 13–18 | 43% | 44% | 1 | 640 RV | ±3.9% |
| Morning Call/Muhlenberg College | February 9–17 | 39% | 42% | 3 | 588 RV | ±4.6% |
| Rasmussen Reports/Pulse Opinion Research | February 14 | 49% | 39% | 10 | 500 LV | ±4.5% |
| Quinnipiac University | February 6–12 | 42% | 41% | 1 | 1,419 RV | ±2.6% |
| Fox News/Rasmussen Reports/Pulse Opinion Research | January 8 | 38% | 46% | 8 | 500 LV | ±3.5% |
| Quinnipiac University | October 1–8, 2007 | 45% | 41% | 4 | 878 RV | ±3.3% |
| Franklin & Marshall College | August 24–September 2, 2007 | 47% | 42% | 5 | 479 RV | ±4.5% |
| Quinnipiac University | August 14–20, 2007 | 43% | 40% | 3 | 1,160 RV | ±2.9% |
| Quinnipiac University | June 18–25, 2007 | 44% | 39% | 5 | 958 RV | ±3.2% |
| Quinnipiac University | May 22, 2007 | 41% | 42% | 1 | 1,318 RV | ±2.7% |
| Morning Call/Muhlenberg College | May 15–21, 2007 | 36% | 39% | 3 | 416 RV | Not reported |
| Quinnipiac University | April 17–24, 2007 | 43% | 41% | 2 | 988 RV | ±3.1% |
| Quinnipiac University | March 19–25, 2007 | 42% | 42% | Tied | 1,187 RV | ±2.8% |
| Quinnipiac University | February 25–March 4, 2007 | 38% | 43% | 5 | 1,134 RV | ±2.9% |
| Franklin & Marshall College | February 19–25, 2007 | 37% | 43% | 6 | 540 RV | ±4.2% |
| Quinnipiac University | February 1–5, 2007 | 39% | 46% | 7 | 1,104 RV | ±3.1% |
Four-way race
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Bob Barr | Ralph Nader | Margin | Sample size | Margin of error |
| CNN/Opinion Research Corporation | October 23–28 | 53% | 41% | 2% | 3% | 12 | 768 LV | ±3.5% |
| Associated Press/Roper/GfK Group | October 22–26 | 52% | 40% | 1% | 1% | 12 | 607 LV | ±4.0% |
| Fox News/Rasmussen Reports/Pulse Opinion Research | September 28 | 50% | 42% | 2% | 3% | 8 | 500 LV | ±4.5% |
| Fox News/Rasmussen Reports/Pulse Opinion Research | September 21 | 48% | 45% | 1% | 1% | 3 | 500 LV | ±4.5% |
| Fox News/Rasmussen Reports/Pulse Opinion Research | September 14 | 47% | 47% | 1% | 1% | Tied | 500 LV | ±4.5% |
| Fox News/Rasmussen Reports/Pulse Opinion Research | September 7 | 47% | 45% | 1% | 1% | 2 | 500 LV | ±4.5% |
| CNN/Time/Opinion Research Corporation | August 24–26 | 47% | 38% | 1% | 7% | 9 | 669 RV | ±4% |
| Zogby Interactive | August 15–19 | 46% | 37% | 5% | 3% | 9 | 557 LV | ±4.2% |
| Zogby Interactive | June 11–30 | 46% | 36% | 5% | 2% | 10 | 1,935 LV | ±2.3% |

### Rhode Island

4 electoral votes (Democrat in 2000 & 2004)
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Margin | Sample size | Margin of error |
| Polimetrix/YouGov | October 18–November 1 | 58% | 37% | 21 | 365 RV | Not reported |
| Rhode Island College | September 17–24 | 45% | 31% | 14 | 742 RV | ±3.6% |
| Brown University | September 15–16 | 47.4% | 34% | 13.4 | 652 RV | ±3.8% |
| Rasmussen Reports/Pulse Opinion Research | September 13 | 58% | 39% | 19 | 500 LV | ±4.5% |
| American Research Group | September 11–13 | 59% | 33% | 26 | 600 LV | ±4% |
| Brown University | August 18–20 | 50.6% | 30% | 20.6 | 548 RV | ±4% |
| Rasmussen Reports/Pulse Opinion Research | June 30 | 55% | 31% | 24 | 500 LV | ±4.5% |
| Rhode Island College | June 18–27 | 53% | 25% | 28 | 500 RV | ±4.0% |
| SurveyUSA | February 26–28 | 53% | 38% | 15 | 628 RV | ±4% |
| Brown University | February 9–10 | 42% | 30% | 12 | 739 RV | ±4% |
| Brown University | September 8–9, 2007 | 46% | 27% | 19 | 571 RV | ±4% |
| Brown University | January 27, 2007 | 40% | 37% | 3 | 475 RV | ±5% |

### South Carolina

8 electoral votes (Republican in 2000 & 2004)
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Margin | Sample size | Margin of error |
| Polimetrix/YouGov | October 18–November 1 | 44% | 52% | 8 | 728 RV | Not reported |
| WCSC-TV Charleston/SurveyUSA | October 28–29 | 44% | 52% | 8 | 654 LV | ±3.9% |
| NBC News/Princeton Survey Research Associates International | October 25–28 | 42% | 53% | 11 | 400 LV | ±5% |
| Rasmussen Reports/Pulse Opinion Research | October 20 | 43% | 54% | 11 | 500 LV | ±4.5% |
| ETV/Winthrop University | September 28–October 19 | 34.9% | 55.1% | 20.2 | 617 LV | ±3.9% |
| WCSC-TV Charleston/SurveyUSA | October 12–13 | 41% | 55% | 14 | 561 LV | ±4.2% |
| WCSC-TV Charleston/SurveyUSA | September 21–22 | 39% | 58% | 19 | 690 LV | ±3.8% |
| Rasmussen Reports/Pulse Opinion Research | September 18 | 45% | 51% | 6 | 500 LV | ±4.5% |
| American Research Group | September 14–17 | 37% | 59% | 22 | 600 LV | ±4% |
| Rasmussen Reports/Pulse Opinion Research | June 5 | 39% | 48% | 9 | 500 LV | ±4% |
| SurveyUSA | February 26–28 | 45% | 48% | 3 | 595 RV | ±4.1% |
Three-way race
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Bob Barr | Margin | Sample size | Margin of error |
| Public Policy Polling | July 9–11 | 39% | 45% | 5% | 6 | 542 LV | ±4.2% |
Four-way race
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Bob Barr | Ralph Nader | Margin | Sample size | Margin of error |
| Zogby Interactive | June 18–30 | 42% | 41% | 6% | 1% | 1 | 630 LV | ±4.0% |

### South Dakota

3 electoral votes (Republican in 2000 & 2004)
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Margin | Sample size | Margin of error |
| Polimetrix/YouGov | October 18–November 1 | 43% | 52% | 9 | 352 RV | Not reported |
| Rasmussen Reports/Pulse Opinion Research | October 30 | 44% | 53% | 9 | 500 LV | ±4.5% |
| Argus Leader Media/KELO-TV/Mason-Dixon Polling & Research | October 13–15 | 41% | 48% | 7 | 800 LV | ±3.5% |
| American Research Group | September 19–21 | 39% | 55% | 16 | 600 LV | ±4% |
| Rasmussen Reports/Pulse Opinion Research | September 9 | 37% | 54% | 17 | 500 LV | ±4.5% |
| Rasmussen Reports/Pulse Opinion Research | July 9 | 43% | 47% | 4 | 500 LV | ±4.5% |
| Dakota Wesleyan University | March 24–April 3 | 34% | 51% | 17 | 267 RV | ±6% |
| Rasmussen Reports/Pulse Opinion Research | March 4 | 38% | 48% | 10 | 500 LV | ±4.5% |
| SurveyUSA | February 26–28 | 43% | 47% | 4 | 632 RV | ±4% |

### Tennessee

11 electoral votes (Republican in 2000 & 2004)
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Margin | Sample size | Margin of error |
| Polimetrix/YouGov | October 18–November 1 | 44% | 53% | 9 | 653 RV | Not reported |
| Rasmussen Reports/Pulse Opinion Research | October 16 | 42% | 54% | 12 | 500 LV | ±4.5% |
| Ayres, McHenry & Associates (R) | October 12–15 | 39% | 54% | 15 | 600 LV | ±4% |
| Rasmussen Reports/Pulse Opinion Research | September 29 | 39% | 58% | 19 | 500 LV | ±4.5% |
| Middle Tennessee State University | September 15–27 | 35% | 55% | 20 | 357 LV | Not reported |
| Chattanooga Times Free Press/Mason-Dixon Polling & Research | September 22–24 | 39% | 55% | 16 | 625 LV | ±4% |
| American Research Group | September 16–19 | 36% | 59% | 23 | 600 LV | ±4% |
| Rasmussen Reports/Pulse Opinion Research | August 20 | 35% | 60% | 25 | 500 LV | ±4.5% |
| Ayres, McHenry & Associates (R) | August 10–12 | 36% | 51% | 15 | 500 RV | ±4.38% |
| Rasmussen Reports/Pulse Opinion Research | June 24 | 36% | 51% | 15 | 500 LV | ±4.5% |
| Rasmussen Reports/Pulse Opinion Research | April 3 | 31% | 58% | 27 | 500 LV | ±4.5% |
| Ayres, McHenry & Associates (R) | March 5–9 | 36% | 53% | 17 | 600 RV | ±4% |
| SurveyUSA | February 26–28 | 38% | 54% | 16 | 618 RV | ±4% |
| Middle Tennessee State University | February 11–23 | 36% | 50% | 14 | 577 A | ±4% |
| Middle Tennessee State University | October 17–27, 2007 | 35% | 44% | 9 | 593 A | ±4% |
Four-way race
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Bob Barr | Ralph Nader | Margin | Sample size | Margin of error |
| Zogby Interactive | June 11–30 | 36% | 41% | 7% | 1% | 5 | 1,004 LV | ±3.2% |

### Texas

34 electoral votes (Republican in 2000 & 2004)
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Margin | Sample size | Margin of error |
| Polimetrix/YouGov | October 18–November 1 | 43% | 54% | 11 | 972 RV | Not reported |
| Rasmussen Reports/Pulse Opinion Research | October 21 | 44% | 54% | 10 | 500 LV | ±4.5% |
| American Research Group | October 5–8 | 38% | 57% | 19 | 600 LV | ±4% |
| Rasmussen Reports/Pulse Opinion Research | September 29 | 43% | 52% | 9 | 500 LV | ±4.5% |
| American Research Group | September 16–19 | 36% | 57% | 21 | 600 LV | ±4% |
| Rasmussen Reports/Pulse Opinion Research | August 21 | 44% | 54% | 10 | 500 LV | ±4.5% |
| Rasmussen Reports/Pulse Opinion Research | July 30 | 44% | 52% | 8 | 500 LV | ±4.5% |
| | June 25 | 39% | 48% | 9 | 500 LV | ±4.5% |
| Rasmussen Reports/Pulse Opinion Research | June 2 | 39% | 52% | 13 | 500 LV | ±4.5% |
| Baselice & Associates | May 20–25 | 36% | 52% | 16 | 1,005 RV | ±3% |
| Rasmussen Reports/Pulse Opinion Research | May 1 | 43% | 48% | 5 | 500 LV | ±4.5% |
| Baselice & Associates | April 25 | 35% | 52% | 17 | 801 RV | Not reported |
| IVR Polls | February 28, March 1 | Not reported | Not reported | 22 | 2,922 LV | ±1.8% |
| WFAA-TV Dallas/Belo/Public Strategies Inc. | February 28–March 1 | 42% | 49% | 7 | 778 LV | ±3.4% |
| SurveyUSA | February 26–28 | 46% | 47% | 1 | 600 RV | ±4.1% |
| KRLD-AM Dallas/KTRK-TV Houston/KTVT-TV Dallas/SurveyUSA | February 23–25 | 41% | 49% | 8 | 1,725 RV | ±2.4% |
| CNN/Opinion Research Corporation | February 14–17 | 44% | 52% | 8 | 1,247 RV | ±3% |
| Texas Lyceum | April 26–May 7, 2007 | 25% | 32% | 7 | Not reported | Not reported |
Three-way race
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Bob Barr | Margin | Sample size | Margin of error |
| University of Texas at Austin | October 15–22 | 38% | 49.3% | 1.3% | 11.3 | 550 RV | ±4.2% |
Four-way race
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Bob Barr | Ralph Nader | Margin | Sample size | Margin of error |
| University of Texas at Austin | July 18–30 | 33% | 43% | 5% | 2% | 10 | 668 RV | Not reported |
| Zogby Interactive | June 11–30 | 39% | 42% | 6% | 2% | 3 | 3,289 LV | ±1.7% |
| Texas Lyceum | June 12–20 | 38% | 43% | 1% | 1% | 5 | Not reported | Not reported |

### Utah

5 electoral votes (Republican in 2000 & 2004)
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Margin | Sample size | Margin of error |
| Polimetrix/YouGov | October 18–November 1 | 34% | 61% | 27 | 395 RV | Not reported |
| Deseret News/KSL-TV/Dan Jones & Associates | October 24–30 | 32% | 57% | 25 | 1,205 RV | ±2.9% |
| Salt Lake Tribune/Mason-Dixon Polling & Research | October 23–25 | 32% | 55% | 23 | 625 LV | ±4% |
| American Research Group | September 10–13 | 29% | 65% | 36 | 600 LV | ±4% |
| Deseret News/KSL-TV/Dan Jones & Associates | September 8–11 | 24% | 62% | 38 | 601 RV | ±4% |
| Rasmussen Reports/Pulse Opinion Research | September 10 | 32% | 64% | 32 | 500 LV | ±4% |
| Las Vegas Review-Journal/Mason-Dixon Polling & Research | August 13–15 | 23% | 62% | 39 | 400 LV | ±5% |
| Rasmussen Reports/Pulse Opinion Research | June 19 | 33% | 52% | 19 | 500 LV | ±4% |
| KSL-TV/Dan Jones & Associates | June 1–3 | 31% | 54% | 23 | 252 LV | Not reported |
| Deseret News/KSL-TV/Dan Jones & Associates | May 13–19 | 27% | 62% | 35 | 604 RV | ±4% |
| SurveyUSA | February 26–28 | 39% | 50% | 11 | 608 RV | ±4.1% |
Three-way race
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Ralph Nader | Margin | Sample size | Margin of error |
| Deseret News/KSL-TV/Dan Jones & Associates | June 16–19 | 29% | 57% | 1% | 28 | 405 RV | Not reported |

### Vermont

3 electoral votes (Democrat in 2000 & 2004)
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Margin | Sample size | Margin of error |
| Polimetrix/YouGov | October 18–November 1 | 62% | 32% | 30 | 275 RV | Not reported |
| Rasmussen Reports/Pulse Opinion Research | October 6 | 65% | 32% | 33 | 500 LV | ±4.5% |
| American Research Group | September 18–22 | 56% | 38% | 18 | 600 LV | ±4% |
| Rasmussen Reports/Pulse Opinion Research | September 13 | 60% | 36% | 24 | 500 LV | ±4.5% |
| SurveyUSA | February 26–28 | 63% | 29% | 34 | 626 RV | ±3.9% |

### Virginia

13 electoral votes (Republican in 2000 & 2004)
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Margin | Sample size | Margin of error |
| Reuters/Zogby International | October 31–November 3 | 51.7% | 45.3% | 6.4 | 600 LV | ±4.1% |
| American Research Group | October 31–November 3 | 51% | 47% | 4 | 600 LV | ±4% |
| Public Policy Polling | October 31–November 2 | 52% | 46% | 6 | 1,557 LV | ±2.5% |
| WDBJ-TV Roanoke/WJHL-TV Tri-Cities/WJLA-TV Washington, D.C./WTVR-TV Richmond/SurveyUSA | October 30–November 1 | 50% | 46% | 4 | 672 LV | ±3.9% |
| Polimetrix/YouGov | October 18–November 1 | 52% | 45% | 7 | 772 RV | Not reported |
| The Virginian-Pilot/Mason-Dixon Polling & Research | October 29–30 | 47% | 44% | 3 | 625 LV | ±4% |
| CNN/Time/Opinion Research Corporation | October 23–28 | 53% | 44% | 9 | 774 LV | ±3.5% |
| Marist College | October 26–27 | 51% | 47% | 4 | 671 LV | ±4% |
| Allstate/National Journal/Financial Dynamics | October 23–27 | 48% | 44% | 4 | 404 RV | ±4.9% |
| WDBJ-TV Roanoke/WJHL-TV Tri-Cities/WJLA-TV Washington, D.C./WTVR-TV Richmond/SurveyUSA | October 25–26 | 52% | 43% | 9 | 671 LV | ±3.9% |
| Reuters/Zogby International | October 23–26 | 52% | 44.8% | 7.2 | 600 LV | ±4.1% |
| Associated Press/Roper/GfK Group | October 22–26 | 49% | 42% | 7 | 601 LV | ±4.0% |
| Roanoke College | October 19–26 | 48% | 39% | 9 | 614 LV | ±4% |
| Washington Post | October 22–25 | 52% | 44% | 8 | 784 LV | ±3.5% |
| Virginia Commonwealth University | October 20–22 | 51% | 40% | 11 | 817 LV | ±4.3% |
| NBC News/Mason-Dixon Polling & Research | October 20–21 | 47% | 45% | 2 | 625 LV | ±4% |
| CNN/Time/Opinion Research Corporation | October 19–21 | 54% | 44% | 10 | 647 LV | ±4% |
| Zogby Interactive | October 17–20 | 49.7% | 46.1% | 3.6 | 922 LV | ±3.3% |
| WDBJ-TV Roanoke/WJHL-TV Tri-Cities/WJLA-TV Washington, D.C./WTVR-TV Richmond/SurveyUSA | October 18–19 | 51% | 45% | 6 | 652 LV | ±3.9% |
| ETV/Winthrop University | September 28–October 19 | 44.6% | 43.6% | 1 | 665 LV | ±3.8% |
| Rasmussen Reports/Pulse Opinion Research | October 16 | 54% | 44% | 10 | 700 LV | ±3% |
| CNN/Time/Opinion Research Corporation | October 11–14 | 53% | 43% | 10 | 698 LV | ±3.5% |
| Christopher Newport University | October 11–14 | 52.3% | 46.8% | 5.5 | 500 LV | ±4.38% |
| Zogby Interactive | October 9–13 | 51.8% | 44% | 7.8 | 872 LV | ±3.4% |
| Public Policy Polling | October 6–7 | 51% | 43% | 8 | 917 LV | ±3.2% |
| WDBJ-TV Roanoke/WJHL-TV Tri-Cities/WJLA-TV Washington, D.C./WTVR-TV Richmond/SurveyUSA | October 3–5 | 53% | 43% | 10 | 666 LV | ±3.9% |
| The Virginian-Pilot/The Richmond Times-Dispatch/Mason-Dixon Polling & Research | September 29–October 1 | 45% | 48% | 3 | 625 LV | ±4% |
| CNN/Time/Opinion Research Corporation | September 28–30 | 53% | 44% | 9 | 684 LV | ±4% |
| Poll Position/InsiderAdvantage | September 29 | 51% | 45% | 6 | 436 LV | ±5% |
| American Research Group | September 27–29 | 46% | 49% | 3 | 600 LV | ±4% |
| Rasmussen Reports/Pulse Opinion Research | September 25 | 50% | 45% | 5 | 700 LV | ±4% |
| NBC News/Mason-Dixon Polling & Research | September 17–22 | 44% | 47% | 3 | 625 LV | ±4% |
| WDBJ-TV Roanoke/WJHL-TV Tri-Cities/WJLA-TV Washington, D.C./WTVR-TV Richmond/SurveyUSA | September 19–21 | 51% | 45% | 6 | 716 LV | ±3.7% |
| ABC News/Washington Post | September 18–21 | 49% | 46% | 3 | 698 LV | ±3.5% |
| American Research Group | September 17–20 | 46% | 48% | 2 | 600 LV | ±4% |
| Poll Position/InsiderAdvantage | September 17 | 46% | 48% | 2 | 502 LV | ±4.3% |
| Allstate/National Journal/Financial Dynamics | September 11–15 | 41% | 49% | 8 | 400 RV | ±4.9% |
| Public Policy Polling | September 13–14 | 48% | 46% | 2 | 1,090 LV | ±3.0% |
| WDBJ-TV Roanoke/WJHL-TV Tri-Cities/WJLA-TV Washington, D.C./WTVR-TV Richmond/SurveyUSA | September 12–14 | 50% | 46% | 4 | 732 LV | ±3.7% |
| Christopher Newport University | September 10–14 | 39% | 48% | 9 | 500 RV | ±4.4% |
| Zogby Interactive | September 9–12 | 43.8% | 50.3% | 6.5 | 689 LV | ±3.8% |
| CNN/Time/Opinion Research Corporation | September 7–9 | 46% | 50% | 4 | 920 RV | ±3% |
| WDBJ-TV Roanoke/WJHL-TV Tri-Cities/WJLA-TV Washington, D.C./WTVR-TV Richmond/SurveyUSA | September 5–7 | 47% | 49% | 2 | 717 LV | ±3.7% |
| Public Policy Polling | August 20–22 | 47% | 45% | 2 | 1,036 LV | ±3.0% |
| Poll Position/InsiderAdvantage | August 12 | 42.6% | 43.1% | 0.5 | 416 LV | ±5% |
| Rasmussen Reports/Pulse Opinion Research | August 12 | 47% | 48% | 1 | 700 LV | ±4.5% |
| WDBJ-TV Roanoke/WJLA-TV Washington, D.C./SurveyUSA | August 8–10 | 47% | 48% | 1 | 655 LV | ±3.9% |
| Public Policy Polling | July 17–20 | 46% | 44% | 2 | 1,327 LV | ±2.7% |
| Rasmussen Reports/Pulse Opinion Research | July 17 | 47% | 48% | 1 | 500 LV | ±4.5% |
| WDBJ-TV Roanoke/WJLA-TV Washington, D.C./SurveyUSA | June 20–22 | 49% | 47% | 2 | 630 LV | ±4% |
| Public Policy Polling | June 14–16 | 47% | 45% | 2 | 893 LV | ±3.3% |
| Rasmussen Reports/Pulse Opinion Research | June 12 | 45% | 44% | 1 | 500 LV | ±4.5% |
| WDBJ-TV Roanoke/WJLA-TV Washington, D.C./SurveyUSA | May 16–18 | 49% | 42% | 7 | 600 RV | ±4.1% |
| Virginia Commonwealth University | May 12–18 | 39% | 47% | 8 | 852 RV | ±4% |
| Rasmussen Reports/Pulse Opinion Research | May 8 | 44% | 47% | 3 | 500 LV | ±4.5% |
| WDBJ-TV Roanoke/WJLA-TV Washington, D.C./SurveyUSA | April 11–13 | 44% | 52% | 8 | 515 RV | ±4.4% |
| Rasmussen Reports/Pulse Opinion Research | March 27 | 41% | 52% | 11 | 500 LV | ±4.5% |
| WDBJ-TV Roanoke/WJLA-TV Washington, D.C./SurveyUSA | March 14–16 | 48% | 47% | 1 | 520 RV | ±4.4% |
| SurveyUSA | February 26–28 | 47% | 47% | Tied | 629 RV | ±4% |
| Rasmussen Reports/Pulse Opinion Research | February 19 | 44% | 49% | 5 | 500 LV | ±4.5% |
| WDBJ-TV Roanoke/WJLA-TV Washington, D.C./WTVR-TV Richmond/SurveyUSA | February 15–17 | 51% | 45% | 6 | 554 RV | ±4.2% |
| WDBJ-TV Roanoke/WJLA-TV Washington, D.C./SurveyUSA | January 16–17 | 40% | 52% | 12 | 535 RV | ±4.3% |
| Rasmussen Reports/Pulse Opinion Research | January 3 | 43% | 45% | 2 | 500 LV | ±4.5% |
| WDBJ-TV Roanoke/WJLA-TV Washington, D.C./SurveyUSA | December 13–15, 2007 | 44% | 50% | 6 | 546 RV | ±4.3% |
| WDBJ-TV Roanoke/WJLA-TV Washington, D.C./SurveyUSA | November 9–11, 2007 | 41% | 51% | 10 | 542 RV | ±4.3% |
| SurveyUSA | March 9–11, 2007 | 40% | 51% | 11 | Not reported | Not reported |
| SurveyUSA | February 9–11, 2007 | 41% | 53% | 12 | Not reported | Not reported |
| WDBJ-TV Roanoke/SurveyUSA | January 12–14, 2007 | 36% | 57% | 21 | 510 RV | ±4.4% |
Four-way race
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Bob Barr | Ralph Nader | Margin | Sample size | Margin of error |
| CNN/Time/Opinion Research Corporation | October 11–14 | 50% | 41% | 3% | 4% | 9 | 698 LV | ±3.5% |
| CNN/Time/Opinion Research Corporation | September 28–30 | 52% | 42% | 2% | 2% | 10 | 684 LV | ±4% |
| Zogby Interactive | August 15–19 | 43% | 41% | 5% | 1% | 2 | 632 LV | ±3.9% |
| Zogby Interactive | June 11–30 | 44% | 39% | 5% | 1% | 5 | 1,261 LV | ±2.8% |
Five-way race
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Bob Barr | Ralph Nader | Cynthia McKinney | Margin | Sample size | Margin of error |
| Fox News/Rasmussen Reports/Pulse Opinion Research | November 2 | 51% | 47% | 0% | 0% | 0% | 4 | 1,000 LV | ±3% |
| Fox News/Rasmussen Reports/Pulse Opinion Research | October 26 | 51% | 47% | 0% | 0% | 0% | 4 | 1,000 LV | ±3% |
| Fox News/Rasmussen Reports/Pulse Opinion Research | October 12 | 50% | 47% | 1% | 0% | 0% | 3 | 1,000 LV | ±3% |
| Fox News/Rasmussen Reports/Pulse Opinion Research | October 5 | 50% | 48% | 1% | 0% | 0% | 2 | 1,000 LV | ±3% |
| Fox News/Rasmussen Reports/Pulse Opinion Research | September 28 | 50% | 47% | 0% | 1% | 1% | 3 | 500 LV | ±4.5% |
| Fox News/Rasmussen Reports/Pulse Opinion Research | September 21 | 48% | 50% | 1% | 0% | 0% | 2 | 500 LV | ±4.5% |
| Fox News/Rasmussen Reports/Pulse Opinion Research | September 14 | 48% | 48% | 0% | 1% | 0% | Tied | 500 LV | ±4.5% |
| Fox News/Rasmussen Reports/Pulse Opinion Research | September 7 | 47% | 49% | 1% | 1% | 0% | 2 | 500 LV | ±4.5% |
Six-way race
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Bob Barr | Ralph Nader | Cynthia McKinney | Chuck Baldwin | Margin | Sample size | Margin of error |
| Associated Press/Roper/GfK Group | October 22–26 | 49% | 42% | 0% | 1% | 1% | 0% | 7 | 601 LV | ±4.0% |
| Suffolk University | October 3–5 | 51% | 39% | 0% | 0% | 0% | 0% | 12 | 600 LV | ±4% |

### Washington

11 electoral votes (Democrat in 2000 & 2004)
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Margin | Sample size | Margin of error |
| KATU-TV Portland/KING-TV Seattle/SurveyUSA | October 30–November 2 | 56% | 40% | 16 | 663 LV | ±3.9% |
| Polimetrix/YouGov | October 18–November 1 | 53% | 43% | 10 | 797 RV | Not reported |
| University of Washington/Pacific Market Research | October 27–31 | 51% | 39% | 12 | 387 RV | ±5.0% |
| KATU-TV Portland/KING-TV Seattle/SurveyUSA | October 26–27 | 56% | 39% | 17 | 630 LV | ±4% |
| University of Washington/Pacific Market Research | October 18–26 | 55% | 34% | 21 | 600 RV | ±4.0% |
| Rasmussen Reports/Pulse Opinion Research | October 22 | 54% | 43% | 11 | 500 LV | ±4.5% |
| Elway Research | October 16–19 | 55% | 36% | 19 | 405 RV | ±5% |
| KATU-TV Portland/KING-TV Seattle/SurveyUSA | October 12–13 | 56% | 40% | 16 | 544 LV | ±4.3% |
| Rasmussen Reports/Pulse Opinion Research | October 2 | 53% | 43% | 10 | 700 LV | ±4% |
| KATU-TV Portland/KING-TV Seattle/SurveyUSA | September 21–22 | 54% | 43% | 11 | 682 LV | ±3.8% |
| American Research Group | September 16–18 | 50% | 44% | 6 | 600 LV | ±4% |
| Rasmussen Reports/Pulse Opinion Research | September 10 | 49% | 47% | 2 | 500 LV | ±4.5% |
| Elway Research | September 6–8 | 46% | 37% | 9 | 225 RV | ±6.5% |
| KATU-TV Portland/KING-TV Seattle/SurveyUSA | September 5–7 | 49% | 45% | 4 | 658 LV | ±3.9% |
| KATU-TV Portland/KING-TV Seattle/SurveyUSA | August 11–12 | 51% | 44% | 7 | 718 LV | ±3.7% |
| Rasmussen Reports/Pulse Opinion Research | August 6 | 54% | 42% | 12 | 500 LV | ±4.5% |
| Elway Research | July 27–31 | 47% | 35% | 12 | 405 RV | ±5% |
| KATU-TV Portland/KING-TV Seattle/SurveyUSA | July 13–15 | 55% | 39% | 16 | 666 LV | ±3.9% |
| Moore Information (R) | July 9–10 | 47% | 37% | 10 | 400 RV | ±5% |
| Rasmussen Reports/Pulse Opinion Research | July 9 | 51% | 43% | 8 | 500 LV | ±4.5% |
| Strategies 360 | June 26 | 47% | 39% | 8 | 1,200 RV | ±2.75% |
| KATU-TV Portland/KING-TV Seattle/SurveyUSA | June 17–19 | 55% | 40% | 15 | 532 LV | ±4.3% |
| Rasmussen Reports/Pulse Opinion Research | June 9 | 53% | 35% | 18 | 500 LV | ±4.5% |
| KATU-TV Portland/KING-TV Seattle/SurveyUSA | June 7–9 | 56% | 39% | 17 | 637 RV | ±3.9% |
| Elway Research | May 21–25 | 44% | 38% | 6 | 405 RV | ±5% |
| KATU-TV Portland/KING-TV Seattle/SurveyUSA | May 16–18 | 52% | 36% | 16 | 600 RV | ±4.1% |
| KING-TV Seattle/SurveyUSA | May 12 | 54% | 42% | 12 | 659 LV | ±3.9% |
| Rasmussen Reports/Pulse Opinion Research | May 12 | 51% | 40% | 11 | 500 LV | ±4.5% |
| KATU-TV Portland/KING-TV Seattle/SurveyUSA | April 14–16 | 53% | 40% | 13 | 634 LV | ±4% |
| KING-TV Seattle/SurveyUSA | April 7 | 51% | 44% | 7 | 607 RV | ±4.1% |
| Rasmussen Reports/Pulse Opinion Research | March 27 | 48% | 43% | 5 | 500 LV | ±4.5% |
| Elway Research | March 18–20 | 45% | 39% | 6 | 405 RV | Not reported |
| KATU-TV Portland/KING-TV Seattle/SurveyUSA | March 14–16 | 52% | 41% | 11 | 510 RV | ±4.4% |
| Rasmussen Reports/Pulse Opinion Research | February 28 | 44% | 45% | 1 | 500 LV | ±4.5% |
| SurveyUSA | February 26–28 | 52% | 38% | 14 | 634 RV | ±4% |
| KING-TV Seattle/SurveyUSA | February 3–4 | 55% | 38% | 17 | 534 RV | ±4.3% |
| KATU-TV Portland/KING-TV Seattle/SurveyUSA | January 11–13 | 52% | 43% | 9 | 527 RV | ±4.4% |
| KATU-TV Portland/KING-TV Seattle/SurveyUSA | December 13–15, 2007 | 50% | 43% | 7 | 513 RV | ±4.4% |
| KATU-TV Portland/KING-TV Seattle/SurveyUSA | November 9–11, 2007 | 45% | 46% | 1 | 517 RV | ±4.4% |
| SurveyUSA | March 9–11, 2007 | 50% | 41% | 9 | Not reported | Not reported |
| SurveyUSA | February 9–11, 2007 | 46% | 46% | Tied | Not reported | Not reported |
| KATU-TV Portland/KING-TV Seattle/SurveyUSA | January 12–14, 2007 | 47% | 46% | 1 | 521 RV | ±4.4% |
Four-way race
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Bob Barr | Ralph Nader | Margin | Sample size | Margin of error |
| Zogby Interactive | June 11–30 | 48% | 35% | 5% | 2% | 13 | 1,373 LV | ±2.7% |

### West Virginia

5 electoral votes (Republican in 2000 & 2004)
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Margin | Sample size | Margin of error |
| American Research Group | October 31–November 3 | 42% | 53% | 11 | 600 LV | ±4% |
| Polimetrix/YouGov | October 18–November 1 | 43% | 52% | 9 | 404 RV | Not reported |
| Public Policy Polling | October 29–30 | 42% | 55% | 13 | 2,128 LV | ±2.1% |
| Reuters/Zogby International | October 23–26 | 40.4% | 50.3% | 9.9 | 600 LV | ±4.1% |
| West Virginia Wesleyan College/The State Journal/Orion Strategies | October 20–21 | 43.5% | 49.2% | 5.7 | 600 LV | ±4% |
| CNN/Time/Opinion Research Corporation | October 19–21 | 44% | 53% | 9 | 674 LV | ±4% |
| Rasmussen Reports/Pulse Opinion Research | October 20 | 43% | 52% | 9 | 500 LV | ±4.5% |
| NBC News/Mason-Dixon Polling & Research | October 16–17 | 41% | 47% | 6 | 625 LV | ±4% |
| Public Policy Polling | October 16–17 | 42% | 50% | 8 | 1,223 LV | ±2.8% |
| Rainmaker Media Group | October 14–15 | 41.3% | 41.7% | 0.4 | 600 RV | Not reported |
| Poll Position/InsiderAdvantage | October 13 | 47% | 49% | 2 | 522 LV | ±4% |
| American Research Group | October 4–8 | 50% | 42% | 8 | 600 LV | ±4% |
| Rasmussen Reports/Pulse Opinion Research | September 24 | 42% | 50% | 8 | 500 LV | ±4.5% |
| CNN/Time/Opinion Research Corporation | September 21–23 | 46% | 50% | 4 | 694 LV | ±3.5% |
| West Virginia Wesleyan College/The State Journal/Orion Strategies | September 21–22 | 40.7% | 51.7% | 11 | 600 LV | ±4 |
| American Research Group | September 14–16 | 45% | 49% | 4 | 600 LV | ±4% |
| Mark Blankenship Enterprises | September 5–8 | 39% | 44% | 5 | 432 RV | ±4.7% |
| Rasmussen Reports/Pulse Opinion Research | June 2 | 35% | 47% | 12 | 500 LV | ±4.5% |
| SurveyUSA | February 26–28 | 35% | 53% | 18 | 617 RV | ±4% |
Four-way race
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Ralph Nader | Cynthia McKinney | Margin | Sample size | Margin of error |
| CNN/Opinion Research Corporation | October 19–21 | 41% | 53% | 2% | 1% | 12 | 674 LV | ±4% |

### Wisconsin

10 electoral votes (Democrat in 2000 & 2004)
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Margin | Sample size | Margin of error |
| Polimetrix/YouGov | October 18–November 1 | 53% | 41% | 12 | 976 RV | Not reported |
| KSTP-TV Minneapolis/WDIO-TV Duluth/WGBA-TV Green Bay/SurveyUSA | October 28–29 | 55% | 39% | 16 | 667 LV | ±3.9% |
| University of Wisconsin (Badger Poll) | October 21–28 | 52% | 42% | 10 | 359 LV | ±5.2% |
| Rasmussen Reports/Pulse Opinion Research | October 23 | 51% | 44% | 7 | 500 LV | ±4.5% |
| Big Ten | October 19–22 | 52.9% | 40.5% | 12.4 | 584 LV | ±4.2% |
| Allstate/National Journal/Financial Dynamics | October 16–20 | 53% | 40% | 13 | 405 RV | ±4.5% |
| KSTP-TV Minneapolis/WDIO-TV Duluth/WGBA-TV Green Bay/SurveyUSA | October 18–19 | 51% | 43% | 8 | 641 LV | ±3.9% |
| NBC News/Mason-Dixon Polling & Research | October 16–17 | 51% | 39% | 12 | 625 LV | ±4% |
| Wisconsin Public Radio/St. Norbert College | October 9–17 | 51% | 38% | 13 | 400 LV | ±5% |
| University of Wisconsin Milwaukee | October 8–15 | 51.4% | 36.3% | 15.1 | 391 LV | ±5.0% |
| Washington Post/Wall Street Journal/Quinnipiac University | October 8–12 | 54% | 37% | 17 | 1,201 LV | ±2.8% |
| Washington Post/Wall Street Journal/Quinnipiac University | October 3–7 | 51% | 43% | 8 | 1,081 LV | ±3% |
| Rasmussen Reports/Pulse Opinion Research | October 6 | 54% | 44% | 10 | 700 LV | ±4% |
| KSTP-TV Minneapolis/WDIO-TV Duluth/WGBA-TV Green Bay/SurveyUSA | October 5–6 | 52% | 42% | 10 | 672 LV | ±3.9% |
| CNN/Time/Opinion Research Corporation | October 3–6 | 51% | 46% | 5 | 859 LV | ±3.5% |
| American Research Group | September 18–21 | 50% | 45% | 5 | 600 LV | ±4% |
| Washington Post/Wall Street Journal/Quinnipiac University | September 14–21 | 49% | 42% | 7 | 1,313 LV | ±2.7% |
| Big Ten | September 14–17 | 45.2% | 44.3% | 0.9 | 616 RV | ±4% |
| CNN/Time/Opinion Research Corporation | September 14–16 | 50% | 47% | 3 | 950 RV | ±3% |
| Rasmussen Reports/Pulse Opinion Research | September 15 | 48% | 46% | 2 | 700 LV | ±4% |
| Rasmussen Reports/Pulse Opinion Research | August 5 | 51% | 44% | 7 | 500 LV | ±4.5% |
| Wisconsin Policy Research Institute | August 3–4 | 44% | 38% | 6 | 600 LV | ±4% |
| Washington Post/Wall Street Journal/Quinnipiac University | July 14–22 | 50% | 39% | 11 | 1,094 LV | ±3% |
| Rasmussen Reports/Pulse Opinion Research | July 8 | 50% | 39% | 11 | 500 LV | ±4.5% |
| Washington Post/Wall Street Journal/Quinnipiac University | June 17–24 | 52% | 39% | 13 | 1,537 LV | ±2.5% |
| KSTP-TV Minneapolis/WDIO-TV Duluth/SurveyUSA | June 13–16 | 52% | 43% | 9 | 538 LV | ±4.3% |
| WisPolitics.com/University of Wisconsin | June 8–10 | 50% | 37% | 13 | 506 LV | ±4.5% |
| Rasmussen Reports/Pulse Opinion Research | June 5 | 45% | 43% | 2 | 500 LV | ±4.5% |
| KSTP-TV Minneapolis/WDIO-TV Duluth/SurveyUSA | May 16–18 | 48% | 42% | 6 | 600 RV | ±4.1% |
| Rasmussen Reports/Pulse Opinion Research | May 5 | 43% | 47% | 4 | 500 LV | ±4.5% |
| University of Wisconsin (Badger Poll) | April 15–24 | 47% | 43% | 4 | 345 LV | ±5.3% |
| KSTP-TV Minneapolis/WDIO-TV Duluth/SurveyUSA | April 11–13 | 49% | 44% | 5 | 541 LV | ±4.3% |
| Wisconsin Public Radio/St. Norbert College | March 25–April 5 | 46% | 42% | 4 | 400 A | ±5% |
| Rasmussen Reports/Pulse Opinion Research | March 26 | 46% | 48% | 2 | 500 LV | ±4.5% |
| KSTP-TV Minneapolis/WDIO-TV Duluth/SurveyUSA | March 14–16 | 48% | 44% | 4 | 528 RV | ±4.4% |
| SurveyUSA | February 26–28 | 51% | 40% | 11 | 597 RV | ±4.1% |
| Rasmussen Reports/Pulse Opinion Research | February 21 | 44% | 43% | 1 | 500 LV | ±4.5% |
| KSTP-TV Minneapolis/WDIO-TV Duluth/SurveyUSA | February 15–17 | 52% | 42% | 10 | 537 RV | ±4.3% |
| KSTP-TV Minneapolis/WDIO-TV Duluth/SurveyUSA | January 20–21 | 44% | 46% | 2 | 532 RV | ±4.3% |
| KSTP-TV Minneapolis/WDIO-TV Duluth/SurveyUSA | December 13–15, 2007 | 46% | 44% | 2 | 543 RV | ±4.3% |
| KSTP-TV Minneapolis/WDIO-TV Duluth/SurveyUSA | November 9–11, 2007 | 43% | 47% | 4 | 528 RV | ±4.4% |
| SurveyUSA | March 9–11, 2007 | 41% | 47% | 6 | Not reported | Not reported |
| SurveyUSA | February 9–11, 2007 | 48% | 42% | 6 | Not reported | Not reported |
| WDIO-TV Duluth/SurveyUSA | January 12–14, 2007 | 44% | 44% | Tied | 498 RV | ±4.5% |
Four-way race
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Bob Barr | Ralph Nader | Margin | Sample size | Margin of error |
| Zogby Interactive | June 11–30 | 48% | 38% | 4% | 1% | 10 | 861 LV | ±3.4% |

### Wyoming

3 electoral votes (Republican in 2000 & 2004)
| Poll Source | Date administered (2008) | Barack Obama | John McCain | Margin | Sample size | Margin of error |
| Polimetrix/YouGov | October 18–November 1 | 29% | 67% | 38 | 246 RV | Not reported |
| Roll Call/Capitol Hill/SurveyUSA | October 18–19 | 37% | 58% | 21 | 604 LV | ±4% |
| Rasmussen Reports/Pulse Opinion Research | September 10 | 39% | 58% | 19 | 500 LV | ±4% |
| Las Vegas Review-Journal/Mason-Dixon Polling & Research | August 13–15 | 25% | 62% | 37 | 400 LV | ±5% |
| SurveyUSA | February 26–28 | 35% | 54% | 19 | 576 RV | ±4.2% |