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Maine Senate 2026

Polling average and every underlying poll — published numbers come only from the precomputed race_averages table.

D+2.7

Graham Platner (D) 47.8% vs Susan Collins (R) 45.1%

20 polls in the average · latest Jun 27, 2026 · weighted by recency (45-day half-life) and sample size

Matchup: verified nominees ✓ · Avg pollster grade 2.3 / 3.0

Every poll in the average

Each poll appears as two dots at its end date. Dashed lines mark the current published average — no trend line is drawn, by design.

35%40%45%50%55%Nov ’25Jan ’26Mar ’26May ’26Jul ’26Beacon Research/Shaw & Co. Research · Jun 23–27, 2026: Platner 47%Beacon Research/Shaw & Co. Research · Jun 23–27, 2026: Collins 50%The New York Times/Siena University · Jun 19–26, 2026: Platner 49%The New York Times/Siena University · Jun 19–26, 2026: Collins 47%Wick · Jun 11–14, 2026: Platner 47.6%Wick · Jun 11–14, 2026: Collins 45.4%Quantus Insights · Jun 9–11, 2026: Platner 46%Quantus Insights · Jun 9–11, 2026: Collins 45%Tavern Research · Jun 5–8, 2026: Platner 51%Tavern Research · Jun 5–8, 2026: Collins 49%The Public Sentiment Institute · Jun 8, 2026: Platner 43%The Public Sentiment Institute · Jun 8, 2026: Collins 44%Fabrizio, Lee & Associates/Impact Research · Jun 1–3, 2026: Platner 46%Fabrizio, Lee & Associates/Impact Research · Jun 1–3, 2026: Collins 46%University of New Hampshire · May 21–25, 2026: Platner 51%University of New Hampshire · May 21–25, 2026: Collins 42%Pan Atlantic SMS Group · May 8–18, 2026: Platner 48%Pan Atlantic SMS Group · May 8–18, 2026: Collins 41%University of New Hampshire · May 13–16, 2026: Platner 48%University of New Hampshire · May 13–16, 2026: Collins 43%Echelon Insights · Apr 3–9, 2026: Platner 51%Echelon Insights · Apr 3–9, 2026: Collins 45%Maine People's Resource Center · Mar 20–31, 2026: Platner 48.3%Maine People's Resource Center · Mar 20–31, 2026: Collins 39.3%Emerson College · Mar 21–23, 2026: Platner 47.8%Emerson College · Mar 21–23, 2026: Collins 40.6%Quantus Insights · Mar 3–5, 2026: Platner 48.6%Quantus Insights · Mar 3–5, 2026: Collins 41.8%Pan Atlantic SMS Group · Feb 13 – Mar 2, 2026: Platner 44%Pan Atlantic SMS Group · Feb 13 – Mar 2, 2026: Collins 40%University of New Hampshire · Feb 12–16, 2026: Platner 49%University of New Hampshire · Feb 12–16, 2026: Collins 38%Fabrizio, Lee & Associates/Impact Research · Jan 20–24, 2026: Platner 44%Fabrizio, Lee & Associates/Impact Research · Jan 20–24, 2026: Collins 45%Pan Atlantic SMS Group · Nov 29 – Dec 7, 2025: Platner 43%Pan Atlantic SMS Group · Nov 29 – Dec 7, 2025: Collins 42%Maine People's Resource Center · Oct 26–29, 2025: Platner 45%Maine People's Resource Center · Oct 26–29, 2025: Collins 41%Zenith Research · Oct 7–10, 2025: Platner 38%Zenith Research · Oct 7–10, 2025: Collins 38%47.8 — current average45.1 — current average

Polls in this average

Selection matches refresh_race_averages(): general-election polls of this race that tested both Graham Platner and Susan Collins. Partisan and internal polls are included in the average (flagged below), matching the published methodology.

PollsterGradeDatesSamplePlatner %Collins %Margin
Beacon Research/Shaw & Co. Research2.8Jun 23–27, 20261,003 RV4750R+3.0↗
The New York Times/Siena University3.0Jun 19–26, 2026608 LV4947D+2.0↗
Wick1.4Jun 11–14, 20261,008 LV47.645.4D+2.2↗
Quantus Insights—Jun 9–11, 2026870 LV4645D+1.0↗
Tavern Research—Jun 5–8, 20261,642 LV5149D+2.0↗
The Public Sentiment Institute—Jun 8, 2026497 LV4344R+1.0↗
Fabrizio, Lee & Associates/Impact ResearchR partisan1.7Jun 1–3, 2026800 LV4646Even↗
University of New Hampshire2.4May 21–25, 20261,280 LV5142D+9.0↗
Pan Atlantic SMS Group2.1May 8–18, 2026827 LV4841D+7.0↗
University of New Hampshire2.4May 13–16, 2026650 LV4843D+5.0↗
Echelon Insights2.7Apr 3–9, 2026378 LV5145D+6.0↗
Maine People's Resource Center1.9Mar 20–31, 20261,167 LV48.339.3D+9.0↗
Emerson College2.9Mar 21–23, 20261,075 LV47.840.6D+7.2↗
Quantus Insights—Mar 3–5, 2026800 LV48.641.8D+6.8↗
Pan Atlantic SMS Group2.1Feb 13 – Mar 2, 2026810 LV4440D+4.0↗
University of New Hampshire2.4Feb 12–16, 20261,105 LV4938D+11.0↗
Fabrizio, Lee & Associates/Impact ResearchR partisan1.7Jan 20–24, 2026800 LV4445R+1.0↗
Pan Atlantic SMS Group2.1Nov 29 – Dec 7, 2025820 LV4342D+1.0↗
Maine People's Resource Center1.9Oct 26–29, 2025783 RV4541D+4.0↗
Zenith Research—Oct 7–10, 2025501 LV3838Even↗

Other 2026 Senate polls in Maine

General-election polls for this race that are not in the average — they tested a different matchup than Platner vs Collins. Shown for transparency; primaries are excluded entirely.

PollsterDatesTop results
Quantus InsightsSep 14–15, 2026Susan Collins 47.1 · Troy Jackson 46.4
YouGovSep 2–8, 2026Troy Jackson 48 · Susan Collins 44
Beacon Research/Shaw & Co. ResearchAug 6–10, 2026Troy Jackson 48 · Susan Collins 46
Hart Research Associates/Public Opinion StrategiesD partisanJul 27 – Aug 1, 2026Troy Jackson 49 · Susan Collins 45
University of New HampshireJul 15–20, 2026Troy Jackson 49 · Susan Collins 46
Echelon InsightsApr 3–9, 2026Janet Mills 48 · Susan Collins 46
Maine People's Resource CenterMar 20–31, 2026Susan Collins 45 · Janet Mills 41.9
Emerson CollegeMar 21–23, 2026Janet Mills 46.2 · Susan Collins 42.5
Quantus InsightsMar 3–5, 2026Susan Collins 44.6 · Janet Mills 43
Pan Atlantic SMS GroupFeb 13 – Mar 2, 2026Janet Mills 44 · Susan Collins 44
University of New HampshireFeb 12–16, 2026Janet Mills 41 · Susan Collins 40
Fabrizio, Lee & Associates/Impact ResearchR partisanJan 20–24, 2026Susan Collins 45 · Janet Mills 44
Pan Atlantic SMS GroupNov 29 – Dec 7, 2025Janet Mills 43 · Susan Collins 43
CyngalNov 10–11, 2025Dem 49 · Susan Collins 41
Maine People's Resource CenterOct 26–29, 2025Susan Collins 46 · Janet Mills 42
Zenith ResearchOct 7–10, 2025Janet Mills 42 · Susan Collins 37

Candidates

Democrats
  • Dem
  • Graham Platner
  • Janet Mills
  • Troy Jackson
Republicans
  • Susan Collins

Party labels curated from public sources.