| Poll | Date | Sample | MoE | Clinton (D) | Paul (R) | Spread |
|---|---|---|---|---|---|---|
| RCP Average | 7/7 - 4/26 | -- | -- | 44.0 | 43.0 | Clinton +1.0 |
| PPP (D) | 4/23 - 4/26 | 1219 RV | 2.8 | 45 | 43 | Clinton +2 |
| Quinnipiac | 3/29 - 4/7 | 948 RV | 3.2 | 42 | 43 | Paul +1 |
| Des Moines Register/Bloomberg | 10/3 - 10/8 | 1107 LV | 2.9 | 44 | 41 | Clinton +3 |
| NBC News/Marist | 7/7 - 7/13 | 753 RV | 3.6 | 45 | 45 | Tie |
| Poll | Date | Sample | MoE | Clinton (D) | Paul (R) | Spread |
|---|---|---|---|---|---|---|
| RCP Average | 7/7 - 4/26 | -- | -- | 44.0 | 43.0 | Clinton +1.0 |
| PPP (D) | 4/23 - 4/26 | 1219 RV | 2.8 | 45 | 43 | Clinton +2 |
| Quinnipiac | 3/29 - 4/7 | 948 RV | 3.2 | 42 | 43 | Paul +1 |
| Quinnipiac | 2/5 - 2/15 | 1089 RV | 3.0 | 45 | 37 | Clinton +8 |
| Des Moines Register/Bloomberg | 10/3 - 10/8 | 1107 LV | 2.9 | 44 | 41 | Clinton +3 |
| PPP (D) | 9/25 - 9/28 | 1192 LV | 2.8 | 47 | 42 | Clinton +5 |
| NBC News/Marist | 7/7 - 7/13 | 753 RV | 3.6 | 45 | 45 | Tie |
| Quinnipiac | 6/12 - 6/16 | 1277 RV | 2.7 | 46 | 40 | Clinton +6 |
| Loras College | 6/4 - 6/5 | 600 LV | 4.0 | 52 | 38 | Clinton +14 |
| PPP (D) | 5/15 - 5/19 | 914 RV | 3.2 | 46 | 42 | Clinton +4 |
| WFB/The Polling Company (R) | 4/13 - 4/14 | 600 LV | 4.1 | 43 | 44 | Paul +1 |
| Quinnipiac | 3/5 - 3/10 | 1411 RV | 2.6 | 49 | 39 | Clinton +10 |
| PPP (D) | 2/20 - 2/23 | 869 RV | 3.3 | 47 | 42 | Clinton +5 |
| Quinnipiac | 12/10 - 12/15 | 1617 RV | 2.4 | 45 | 44 | Clinton +1 |
| Harper (R) | 11/23 - 11/24 | 985 LV | 3.1 | 47 | 41 | Clinton +6 |
| PPP (D) | 7/5 - 7/7 | 668 RV | 3.8 | 48 | 37 | Clinton +11 |
| Quinnipiac | 5/15 - 5/21 | 1411 RV | 2.6 | 46 | 42 | Clinton +4 |