 | Iowa will also elect a United States Senator. If the election for United States Senator were today, would you vote for ... (choices rotated) Republican Chris Reed? Or Democrat Tom Harkin? |
| TRACK POINTS | 09/19/08 | 10/10/08 | 10/30/08 | n/a | n/a | n/a | n/a | n/a | n/a |
| ± 3.7% | ± 3.8% | ± 3.8% | n/a | n/a | n/a | n/a | n/a | n/a |
| ALL | ALL | ALL | n/a | n/a | n/a | n/a | n/a | n/a |
| Chris Reed (R) | 37% | 37% | 35% | n/a | n/a | n/a | n/a | n/a | n/a |
| Tom Harkin (D) | 60% | 58% | 61% | n/a | n/a | n/a | n/a | n/a | n/a |
| Undecided | 3% | 6% | 3% | n/a | n/a | n/a | n/a | n/a | n/a |
| Total | 100% | 100% | 100% | n/a | n/a | n/a | n/a | n/a | n/a |