Maine
Maine Senate 2026
Lean RGeneralIncumbent: Susan Collins (R)
Incumbent Susan Collins faces a genuinely competitive re-election bid in Maine. The race is expected to be decided by a narrow margin.
Graham Platner
Oyster farmer and military veteran
60.2%
Susan Collins
U.S. Senator from Maine (incumbent)
42.4%
Janet Mills
Governor of Maine
14.8%
David Costello
Former government official, 2024 Senate nominee
4.2%
Polling
Polling Average
Polling average as of Jun 8, 2026 · updated 2 days ago
Polling trend chart from 2025-10-23 to 2026-06-08. Latest averages: Susan Collins 42.4%, Janet Mills 14.8%, Graham Platner 60.2%, David Costello 4.2%.
Recent Polls(14)
| Pop | Platner | Collins | Mills | Costello | |||
|---|---|---|---|---|---|---|---|
| 2026-06-08 | Tavern Researchunrated | 704 | LV | 68% | — | 16% | 5% |
| 2026-06-04 | UMass Lowellunrated | 650 | LV | 48% | 43% | — | — |
| 2026-05-27 | Univ. of New Hampshireunrated | 595 | LV | 76% | — | 10% | 3% |
| 2026-05-20 | Pan Atlantic Researchunrated | 827 | LV | 48% | 41% | — | — |
| 2026-04-21 | Echelon Insightsunrated | 378 | LV | 51% | 45% | — | — |
| 2026-04-07 | Maine People's Resource Centerunrated | 514 | LV | 61% | — | 28% | 2% |
| 2026-03-26 | Emerson Collegeunrated | 530 | LV | 55% | — | 28% | 1% |
| 2026-03-10 | OnMessageunrated | 600 | LV | 44% | 42% | — | — |
| 2026-03-09 | Quantus Insightsunrated | 450 | LV | 43% | — | 38% | — |
| 2026-03-04 | Pan Atlantic Researchunrated | 367 | LV | 46% | — | 39% | 4% |
| 2026-02-24 | Univ. of New Hampshireunrated | 478 | LV | 64% | — | 26% | 1% |
| 2025-12-10 | Pan Atlantic Researchunrated | 318 | LV | 37% | — | 47% | 1% |
| 2025-11-12 | Maine People's Resource Centerunrated | 783 | RV | 45% | 41% | — | — |
| 2025-10-23 | Univ. of New Hampshireunrated | 506 | LV | 58% | — | 24% | 1% |