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

| Poll_Source | Date_ | Candidate | Support | Consider | Oppose | Unsure |
|---|---|---|---|---|---|---|
| Time Poll | Jul 13–17, 2006 | Al Gore | 16% | 45% | 32% | 7% |
| Time Poll | Jul 13–17, 2006 | John Kerry | 12% | 48% | 30% | 10% |
| CNN Poll | Jun 1–6, 2006 | Hillary Rodham Clinton | 22% | 28% | 47% | 3% |
| CNN Poll | Jun 1–6, 2006 | Al Gore | 17% | 32% | 48% | 3% |
| CNN Poll | Jun 1–6, 2006 | John Kerry | 14% | 35% | 47% | 4% |
| CNN Poll | Jun 1–6, 2006 | Rudolph Giuliani | 19% | 45% | 30% | 6% |
| CNN Poll | Jun 1–6, 2006 | John McCain | 12% | 48% | 34% | 6% |
| CNN Poll | Jun 1–6, 2006 | Jeb Bush | 9% | 26% | 63% | 2% |
| ABC News/Washington Post Poll | May 11–15, 2006 | Hillary Clinton | 19% | 38% | 42% | 1% |