| Poll | Date | Sample | MoE | Cain (D) | Poliquin (R) | Richardson (I) | Spread |
|---|---|---|---|---|---|---|---|
| Final Results | -- | -- | -- | 41.8 | 47.1 | 11.0 | Poliquin +5.3 |
| MPRC (D) | 10/31 - 11/2 | 397 LV | 4.9 | 42 | 43 | 10 | Poliquin +1 |
| Pan Atlantic SMS | 10/15 - 10/21 | 186 LV | 7.0 | 39 | 38 | 8 | Cain +1 |
| Portland Press Herald | 10/15 - 10/21 | 291 LV | 5.5 | 40 | 41 | 8 | Poliquin +1 |
| Critical Insights | 9/24 - 9/30 | 295 LV | -- | 36 | 41 | 6 | Poliquin +5 |
| Pan Atlantic SMS | 9/23 - 9/29 | LV | 6.9 | 36 | 33 | 6 | Cain +3 |
| Portland Press Herald | 9/18 - 9/25 | 220 LV | 6.2 | 30 | 40 | 3 | Poliquin +10 |
| Portland Press Herald | 6/12 - 6/18 | 222 LV | 6.5 | 44 | 39 | -- | Cain +5 |