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
Showing the published average. The rating above uses this figure.
The right edge is that same average of the last three polls. This is an average, not a forecast.
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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
DemocratGraham Platner won the June 9 Democratic primary with 72.1% but withdrew from the race in July 2026. Maine Democrats nominated Troy Jackson at the July 25, 2026 state convention in Bangor.
General Election Polling Average
Average is the unweighted mean of the last three scientific public polls. Fewer than three uses the polls that exist. The rating uses that average when the newest poll ended in the last 30 days. The table lists the polls in that average, plus 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 |
|---|---|---|---|---|---|
| InsiderAdvantage (R) 2024 err 1.9 | 2026-10-14 | 1200 LV | ±2.80 | Troy Jackson 49.00% | Susan Collins 47.00% |
| Suffolk University | 2026-10-11 | 500 LV | ±4.40 | Troy Jackson 49.00% | Susan Collins 47.00% |
| Rasmussen Reports (R) 2024 err 2.1 | 2026-10-08 | 804 LV | ±3.00 | Troy Jackson 49.00% | Susan Collins 47.00% |
| The Washington Post/SSPG | 2026-10-05 | 800 LV | ±3.60 | Troy Jackson 50.00% | Susan Collins 46.00% |
| Marist University | 2026-10-04 | 1505 RV | ±3.80 | Troy Jackson 51.00% | Susan Collins 47.00% |
| CBS News/YouGov | 2026-10-01 | 1136 LV | ±4.70 | Troy Jackson 50.00% | Susan Collins 50.00% |
| Trafalgar Group (R) partisan·R 2024 err 1.8 | 2026-10-01 | 1091 LV | ±2.90 | Troy Jackson 46.00% | Susan Collins 46.00% |
| Wedgewood Polls | 2026-10-01 | 400 LV | ±4.90 | Troy Jackson 52.00% | Susan Collins 48.00% |
| co/efficient (R) partisan·R | 2026-09-30 | 1240 LV | ±2.80 | Troy Jackson 46.00% | Susan Collins 48.00% |
| Maine People's Resource Center partisan·D | 2026-09-29 | 684 LV | ±3.80 | Troy Jackson 49.00% | Susan Collins 47.00% |
| InsiderAdvantage (R) 2024 err 1.9 | 2026-09-23 | 1200 LV | ±2.80 | Troy Jackson 46.00% | Susan Collins 46.00% |
| Fabrizio Ward (R)/ Impact Research (D) 2024 err 1.9 R-sponsored | 2026-09-22 | 982 LV | ±3.10 | Troy Jackson 50.00% | Susan Collins 47.00% |
| Siena College Research Institute | 2026-09-22 | 619 LV | ±4.90 | Troy Jackson 46.00% | Susan Collins 49.00% |
| New York Times/Siena University 2024 err 3.1 | 2026-09-22 | 619 LV | ±4.90 | Troy Jackson 46.00% | Susan Collins 49.00% |
| University of New Hampshire | 2026-09-21 | 1312 LV | ±2.70 | Troy Jackson 51.00% | Susan Collins 47.00% |
Questions About This Race
Who is winning the 2026 Maine Senate race?
Troy Jackson leads Susan Collins 49% to 47% in the PollingSource polling average — a D+2.0 margin based on 3 polls, the last three or fewer.
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 InsiderAdvantage (R) (completed October 14, 2026), found Troy Jackson (D) at 49% 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 the last three scientific public polls, or fewer when fewer exist. One poll sets the rating when it ended in the last 30 days. We do not exclude pollsters. The table lists recent polls, including ones older than those three. Full details: pollingsource.com/methodology.
Race Notes
Graham Platner won the June 9 Democratic primary with 72.1% but withdrew from the race in July 2026. Maine Democrats nominated Troy Jackson at the July 25, 2026 state convention in Bangor.
Independent Expenditures Updated just now
Top Spenders
- PINE TREE RESULTS PAC GOP-aligned $25,556,012
- WINSENATE Dem-aligned $24,656,245
- THE MAINE STANDARD GOP-aligned $6,708,812
- SLF PAC GOP-aligned $6,281,386
- GOVERNMENT THAT WORKS PAC Dem-aligned $3,723,322
- STRONGER MAINE GOP-aligned $2,295,778
- CFFE PAC Dem-aligned $1,542,891
- LEAD MAINE COMMITTEE, INC. GOP-aligned $1,402,419
- PLANNED PARENTHOOD VOTES Dem-aligned $1,215,228
- ONE FOR ALL COMMITTEE Dem-aligned $545,000
Full outside-spending research — every committee, every race →
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