Nationwide opinion polling for the United States presidential election, 2008 Support likelihood Support likelihood

| Poll_Source | Date_ | Candidate | Support | Consider | Oppose | Unsure |
|---|---|---|---|---|---|---|
| Newsweek Poll | Nov 9–10, 2006 | Duncan Hunter | 1% | 6% | 19% | 5% |
| Time Poll | Oct 3–4, 2006 | Rudy Giuliani | 17% | 55% | 19% | 18% |
| Time Poll | Oct 3–4, 2006 | Hillary Rodham Clinton | 23% | 36% | 37% | 5% |
| Time Poll | Oct 3–4, 2006 | John McCain | 12% | 56% | 19% | 13% |
| Time Poll | Oct 3–4, 2006 | Al Gore | 16% | 44% | 35% | 5% |
| Time Poll | Oct 3–4, 2006 | John Kerry | 14% | 43% | 34% | 9% |
| Time Poll | Jul 13–17, 2006 | Rudy Giuliani | 17% | 54% | 14% | 15% |
| Time Poll | Jul 13–17, 2006 | Hillary Rodham Clinton | 19% | 41% | 34% | 6% |
| Time Poll | Jul 13–17, 2006 | John McCain | 12% | 52% | 13% | 22% |