Sondagens Nacionais - 13/05/2008
13 05 2008| Race | Poll | Results | Spread |
| Democratic | Gallup Tracking | Obama 50, | Obama +6.0 |
| Democratic | Rasmussen Tracking | Obama 51, | Obama +9.0 |
| Democratic | ABC News/Wash Post | Obama 53, | Obama +12.0 |
| General Election: | ABC News/Wash Post | Clinton 49, | Clinton +3.0 |
| General Election: | ABC News/Wash Post | Obama 51, | Obama +7.0 |
