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

| Poll_Source | Date_ | Candidate | Support | Consider | Oppose | Unsure |
|---|---|---|---|---|---|---|
| ABC News/Washington Post Poll | May 11–15, 2006 | John McCain | 9% | 57% | 28% | 6% |
| FOX News/Opinion Dynamics Poll | Feb 7–8, 2006 | Hillary Clinton | 35% | 19% | 44% | 2% |
| FOX News/Opinion Dynamics Poll | Feb 7–8, 2006 | Rudy Giuliani | 33% | 38% | 24% | 6% |
| FOX News/Opinion Dynamics Poll | Feb 7–8, 2006 | John McCain | 30% | 40% | 22% | 7% |
| FOX News/Opinion Dynamics Poll | Feb 7–8, 2006 | John Kerry | 29% | 23% | 45% | 3% |
| FOX News/Opinion Dynamics Poll | Feb 7–8, 2006 | Condoleezza Rice | 14% | 38% | 46% | 3% |
| CNN/USA Today/Gallup Poll | Jan 20–22, 2006 | Hillary Rodham Clinton | 16% | 32% | 51% | 1% |
| Diageo/Hotline Poll | Nov 11–15, 2005 | John McCain | 23% | 46% | 15% | 15% |