Primary
Democratic Primary
Held June 9, 2026.
| Candidate | Votes | % | |
|---|---|---|---|
| Graham Platner ✓ — Withdrew | 154,084 | 72.1% | |
| Janet Mills | 41,644 | 19.2% | |
| David Costello | 17,560 | 8.1% | |
| Andrea LaFlamme | 1,114 | 0.5% |
Republican Primary
Held June 9, 2026.
| 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 30 days.
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Race page
Candidates
Susan Collins Nominee Incumbent
Republican
Troy Jackson Nominee
DemocratChosen as the Democrat nominee at the July 25, 2026 state convention in Bangor after Graham Platner withdrew; faces Sen. Susan Collins in November.
Graham Platner Won Primary — Withdrew
DemocratWon the June 9, 2026 Democratic primary with 72.1% of the vote; withdrew from the race in July 2026. Maine Democrats will select a replacement nominee at a state convention.
General Election Polling Average
Average reflects all polls from the last 30 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 |
|---|---|---|---|---|---|
| Beacon | 2026-08-10 | Troy Jackson 48.00% | Susan Collins 46.00% | ||
| Beacon Research (D)/ Shaw & Co. Research (R) ±2.3 | 2026-08-10 | 1000 RV | ±3.00 | Troy Jackson 48.00% | Susan Collins 46.00% |
| Fox | 2026-08-10 | RV | Troy Jackson 48.00% | Susan Collins 46.00% | |
| Hart Research (D) partisan·D | 2026-08-01 | 802 LV | ±3.50 | Troy Jackson 49.00% | Susan Collins 45.00% |
| University of New Hampshire | 2026-07-20 | 1178 LV | ±2.90 | Troy Jackson 49.00% | Susan Collins 46.00% |
Questions About This Race
Who is winning the 2026 Maine Senate race?
Troy Jackson leads Susan Collins 48.4% to 45.8% in the PollingSource polling average — a D+2.6 margin based on 5 polls from the last 30 days.
Is the 2026 Maine Senate race competitive?
Yes — the PollingSource polling average rates this race a Toss-up, the most competitive category.
Why is there no Democrat nominee in the 2026 Maine Senate race?
Won the June 9, 2026 Democratic primary with 72.1% of the vote; withdrew from the race in July 2026. Maine Democrats will select a replacement nominee at a state convention.
What does the latest poll of the 2026 Maine Senate race say?
The most recent public poll, from Beacon (completed August 10, 2026), found Troy Jackson (D) at 48% and Susan Collins (R) at 46%.
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 30 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 1 hour ago
Top Spenders
- PINE TREE RESULTS PAC GOP-aligned $6,349,721
- GOVERNMENT THAT WORKS PAC Dem-aligned $1,760,620
- LEAD MAINE COMMITTEE, INC. GOP-aligned $954,880
- PLANNED PARENTHOOD VOTES Dem-aligned $751,822
- SLF PAC GOP-aligned $625,939
- STRONGER MAINE GOP-aligned $567,786
- CLEARPATH ACTION FUND, INC. GOP-aligned $208,039
- LEAGUE OF LABOR VOTERS Dem-aligned $50,000
- NRRC Dem-aligned $36,250
- THE CONSERVATIVE CAUCUS DBA AMERICANS FOR CONSTITUTIONAL LIBERTY GOP-aligned $26,454
Full outside-spending research — every committee, every race →