Primary
Primary held June 9, 2026.
Democratic Primary
| Candidate | Votes | % | |
|---|---|---|---|
| Graham Platner ✓ | 154,084 | 72.1% | |
| Janet Mills | 41,644 | 19.2% | |
| David Costello | 17,560 | 8.1% | |
| Andrea LaFlamme | 1,114 | 0.5% |
Republican Primary
| Candidate | Votes | % | |
|---|---|---|---|
| Susan Collins ✓ | 126,398 | 100.0% |
Full calendar and every race: Maine primary guide
Race Overview
General Election Polling Trend
PollingSource average — trailing average of all polls from the last 90 days.
Candidates
Susan Collins Nominee Incumbent
RepublicanGeneral Election Polling Average
Average reflects all polls from the last 90 days; table shows the most recent 30 days or the newest 3 polls, whichever is more — subscribe for the full history. How accurate is each pollster? →
| Pollster | Date | Sample | MoE | Dem | Rep |
|---|---|---|---|---|---|
| Z to A Research (D) partisan·D | 2026-07-08 | 988 LV | ±3.10 | Shenna Bellows 47.00% | Susan Collins 47.00% |
| PPP partisan·D ±2.0 | 2026-07-07 | 785 | Graham Platner 42.00% | Susan Collins 47.00% | |
| PPP partisan·D ±2.0 | 2026-07-07 | 785 | Troy Jackson 49.00% | Susan Collins 44.00% | |
| PPP partisan·D ±2.0 | 2026-07-07 | 785 | Janet Mills 37.00% | Susan Collins 48.00% | |
| Tavern Research (D) partisan·D | 2026-07-06 | 1074 LV | ±3.40 | Graham Platner 52.00% | Susan Collins 48.00% |
| Wedgewood Polls | 2026-07-06 | 405 LV | ±5.80 | Troy Jackson 48.00% | Susan Collins 43.00% |
| Beacon Research (D)/Shaw & Co. Research (R) ±2.3 | 2026-06-27 | 1003 RV | ±3.00 | Graham Platner 47.00% | Susan Collins 50.00% |
| The New York Times/Siena University ±3.1 | 2026-06-26 | 608 LV | ±5.40 | Graham Platner 49.00% | Susan Collins 47.00% |
| The New York Times/Portland Press Herald/Siena University ±3.1 | 2026-06-26 | 608 LV | ±4.80 | Graham Platner 49.00% | Susan Collins 47.00% |
Questions About This Race
Who is winning the 2026 Maine Senate race?
Shenna Bellows leads Susan Collins 47.3% to 45.4% in the PollingSource polling average — a D+1.9 margin based on 19 polls from the last 90 days.
Is the 2026 Maine Senate race competitive?
Yes — the PollingSource polling average rates this race a Toss-up, the most competitive category.
What does the latest poll of the 2026 Maine Senate race say?
The most recent public poll, from Z to A Research (D) (completed July 8, 2026), found Shenna Bellows (D) at 47% and Susan Collins (R) at 47%.
When is the 2026 Maine Senate race decided?
Election Day is Tuesday, November 3, 2026.
How is the PollingSource average calculated?
The PollingSource average is the unweighted mean of every scientific public poll of the race from the last 90 days — we do not exclude pollsters. Each race page lists the individual polls behind the average with pollster, field dates, sample size, and margin of error. Full details: pollingsource.com/methodology.
Race Notes
NOMINEE PENDING: Graham Platner won the June 9 Democratic primary with 72.1% but withdrew from the race in July 2026. Maine Democrats will select a replacement nominee at a state convention; until then the Democratic nomination is outstanding. Key pickup target for Democrats
Independent Expenditures Updated 4 hours ago
Top Spenders
- PINE TREE RESULTS PAC $10,723,548
- LEAD MAINE COMMITTEE, INC. $811,880
- STRONGER MAINE $569,036
- SLF PAC $518,864
- COMMON DEFENSE ACTION FUND $219,000
- CLEARPATH ACTION FUND, INC. $104,019
- LEAGUE OF LABOR VOTERS $100,000
- NATIONAL NURSES UNITED FOR PATIENT PROTECTION $50,606
- NRRC $36,250
- AMERICAN POLITICAL ACTION COMMITTEE $15,000
Full outside-spending research — every committee, every race →