SenateGovernorCompetitive

Incumbent: Susan Collins (R)

Rating: Toss-up

Candidates: Susan Collins (R) vs Janet Mills, David Costello, Graham Platner (D)

Recent Polls(25 polls)High

DatePollsterGradeMarginSample
Apr 21, 2026Echelon InsightsA-D+3.1378
Apr 9, 2026Echelon Insights (R)A-D+3.1378
Apr 7, 2026Maine People's Resource CenterB/CD+5.21,167
Mar 31, 2026MPRCD+5.21,167
Mar 31, 2026Maine People's Resource Center (D)B/CD+5.21,167
Mar 26, 2026Emerson CollegeAD+3.91,075
Mar 23, 2026Emerson CollegeAD+3.91,075
Mar 10, 2026OnMessageAD+1.2600
Mar 9, 2026Quantus InsightsD+3.9800
Mar 8, 2026OnMessage Public Strategies (R)B/CD+1.2600
Mar 5, 2026Quantus InsightsD+3.9800
Mar 4, 2026Pan Atlantic ResearchA/BD+2.4810
Mar 2, 2026Pan Atlantic ResearchA/BD+2.4810
Mar 2, 2026Pan AtlanticA/BD+2.4810
Feb 24, 2026Univ. of New HampshireB-D+6.31,120
Feb 16, 2026UNHD+0.61,120
Feb 16, 2026University of New HampshireB-D+6.31,105
Jan 24, 2026Fabrizio Lee & AssociatesA/BR+0.6800
Dec 16, 2025Workbench Strategy (D)EVEN900
Dec 10, 2025Pan Atlantic ResearchA/BD+0.6820
Dec 7, 2025Pan Atlantic ResearchA/BD+0.6820
Nov 12, 2025Maine People's Resource CenterB/CD+2.3783
Nov 11, 2025CygnalAD+4.4600
Oct 29, 2025Maine People's Resource CenterB/CD+2.3783
Oct 10, 2025Zenith Research (D)EVEN501

Historical Context

2020 result
Susan Collins (R) R+8.6
2024 presidential (ME)
Harris (D) D+5.9
Model vs. last result
D+13.0 shift vs. last result

About this forecast

  • Structural forecast based on electoral type modeling across 16 counties.
  • Types are discovered from historical shift patterns — not from polls or demographics alone.
  • 25 race-specific polls have been incorporated via Bayesian update through the type covariance structure.

Last updated: Oct 9, 2025