| Poll | Date | Sample | Clinton | Biden | Sanders | Chafee | O'Malley | Webb | Spread |
|---|---|---|---|---|---|---|---|---|---|
| Quinnipiac | 6/4 - 6/15 | 388 RV | 60 | 13 | 10 | 0 | 1 | 0 | Clinton +47 |
| PPP (D) | 6/4 - 6/7 | 360 RV | 61 | -- | 13 | 2 | 2 | 1 | Clinton +48 |
| Quinnipiac | 3/17 - 3/28 | 324 RV | 54 | 9 | 3 | -- | 3 | 2 | Clinton +40 |
| Quinnipiac | 1/22 - 2/1 | 315 RV | 51 | 7 | 5 | -- | 1 | 0 | Clinton +37 |