Opinion polling for the United States Senate elections, 2008 Iowa Iowa

| Poll_Source | Dates_administered | Democrat_Tom_Harkin | Republican_Christopher_Reed | Lead_Margin |
|---|---|---|---|---|
| Survey USA | October 28-October 29, 2008 | 61% | 35% | 26 |
| Rasmussen Reports | October 23, 2008 | 57% | 41% | 16 |
| Rasmussen Reports | September 25, 2008 | 54% | 40% | 14 |
| Survey USA | September 17-September 18, 2008 | 60% | 37% | 23 |
| Des Moines Register/ Selzer & Co | September 8-September 10, 2008 | 53% | 34% | 19 |
| Rasmussen Reports | August 7, 2008 | 60% | 36% | 24 |
| Rasmussen Reports | July 10, 2008 | 55% | 37% | 18 |
| Rasmussen Reports | June 10, 2008 | 53% | 37% | 16 |
| Research 2000 | April 21-April 23, 2008 | 59% | 20% | 39 |