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| Poll | Date | Sample | Obama (D) | McCain (R) | Spread |
|---|---|---|---|---|---|
| RCP Average | 08/04 - 09/10 | -- | 51.5 | 41.8 | Obama +9.7 |
| Des Moines Register | 09/08 - 09/10 | 616 LV | 52 | 40 | Obama +12 |
| CNN/Time | 08/31 - 09/02 | 828 RV | 55 | 40 | Obama +15 |
| Univ. of Iowa | 08/04 - 08/13 | 617 LV | 50 | 43 | Obama +7 |
| Rasmussen | 08/07 - 08/07 | 700 LV | 49 | 44 | Obama +5 |