2026 Democratic primary
Maine Senate Democratic primary average
Platner leads the field at 50.1 percent in the OnPoint average of 10 public polls, weighted by recency, sample size and voter screen.
Average over time
Each dot is one pollPlatner50.1Mills38.0Costello0.9Wood0.1
All polls
10 pollsInternal partisan or internal poll| Pollster | End date | Sample | Platner | Mills | Costello | Wood | Spread |
|---|---|---|---|---|---|---|---|
| OnPoint average | Mar 5, 2026 | 10 polls | 50.1% | 38.0% | 0.9% | 0.1% | Platner +12.1 |
| Quantus InsightsInternal | Mar 5, 2026 | 450LV | 43% | 38% | Platner +5.0 | ||
| Pan Atlantic Research | Mar 2, 2026 | 367LV | 46% | 39% | 4% | Platner +7.0 | |
| University of New Hampshire | Feb 16, 2026 | 462LV | 64% | 26% | 1% | Platner +38.0 | |
| Workbench StrategyInternal | Dec 16, 2025 | 500LV | 55% | 40% | Platner +15.0 | ||
| Pan Atlantic Research | Dec 7, 2025 | 318LV | 37% | 47% | 1% | Mills +10.0 | |
| Z to A ResearchInternal | Nov 18, 2025 | 845LV | 58% | 38% | Platner +20.0 | ||
| Maine People's Resource Center | Oct 29, 2025 | 783LV | 41% | 39% | 5% | Platner +2.0 | |
| SoCal Strategies | Oct 25, 2025 | 500LV | 36% | 41% | 1% | 2% | Mills +5.0 |
| NRSCInternal | Oct 23, 2025 | 647LV | 46% | 25% | 3% | Platner +21.0 | |
| University of New Hampshire | Oct 21, 2025 | 510LV | 58% | 24% | 1% | 1% | Platner +34.0 |