Maine
Maine Senate 2026
Lean RPrimaryIncumbent: 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.
Democratic Primary
Graham Platner
Oyster farmer and military veteran
49.5%
Janet Mills
Governor of Maine
29.8%
David Costello
Former government official, 2024 Senate nominee
1.8%
Republican Primary
Susan Collins
U.S. Senator from Maine (incumbent)
41.6%
Polling
Polling Average
Polling average as of May 20, 2026 · updated 6 days ago
Recent Polls(11)
| Pop | Platner | Collins | Mills | Costello | |||
|---|---|---|---|---|---|---|---|
| 2026-05-20 | Pan Atlantic Research | 827 | LV | 48% | 41% | — | — |
| 2026-04-21 | Echelon Insights | 378 | LV | 51% | 45% | — | — |
| 2026-04-07 | Maine People's Resource Center | 514 | LV | 61% | — | 28% | 2% |
| 2026-03-26 | Emerson College | 530 | LV | 55% | — | 28% | 1% |
| 2026-03-10 | OnMessage | 600 | LV | 44% | 42% | — | — |
| 2026-03-09 | Quantus Insights | 450 | LV | 43% | — | 38% | — |
| 2026-03-04 | Pan Atlantic Research | 367 | LV | 46% | — | 39% | 4% |
| 2026-02-24 | Univ. of New Hampshire | 478 | LV | 64% | — | 26% | 1% |
| 2025-12-10 | Pan Atlantic Research | 318 | LV | 37% | — | 47% | 1% |
| 2025-11-12 | Maine People's Resource Center | 783 | RV | 45% | 41% | — | — |
| 2025-10-23 | Univ. of New Hampshire | 506 | LV | 58% | — | 24% | 1% |