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Pollster file

Maine People's Resource Center

Historical accuracy is measured against certified results. Current-cycle records come from the canonical, deduplicated archive and do not by themselves change the sealed forecast.

Historical polls
12
Mean absolute error
5.91percentage points
Historical bias
D+0.21
Represented cycles
32012–2016
Current archive
8canonical records
History span
Nov 2, 2012through Oct 25, 2016
Identity

Known names and relationships

Known aliases
No additional reviewed aliases
Organization type
Single canonical organization
Cycles represented
2012 · 2014 · 2016

12 eligible historical polls across 3 represented cycles passed the published history identity checks. Historical bias is descriptive and is kept separate from sponsor or client affiliation.

Canonical 2025–2026 archive

Current-cycle records

Archive source date 2026-09-09 · bundled copy. Archive records may be newer than the sealed forecast; inclusion here does not mean the forecast uses them.

8 shown · 8 total

Platner +9

Don't know 12.4% · Graham Platner 48.3% · Susan Collins 39.3%

Field dates
Mar 20–Mar 31, 2026
Sample
1,167 LV
Sponsor / client
Not reported in archive
Partisan sponsorship
No partisan sponsorship flag
Collins +3.1

Don't know 13.1% · Susan Collins 45% · Janet Mills 41.9%

Field dates
Mar 20–Mar 31, 2026
Sample
1,167 LV
Sponsor / client
Not reported in archive
Partisan sponsorship
No partisan sponsorship flag
Platner +3.9

Don't know 14.3% · Graham Platner 44.8% · Susan Collins 40.9%

Field dates
Oct 26–Oct 29, 2025
Sample
783 RV
Sponsor / client
Not reported in archive
Partisan sponsorship
No partisan sponsorship flag
Collins +4.1

Don't know 12.5% · Janet Mills 41.7% · Susan Collins 45.8%

Field dates
Oct 26–Oct 29, 2025
Sample
783 RV
Sponsor / client
Not reported in archive
Partisan sponsorship
No partisan sponsorship flag
Platner +9

Susan Collins 39.3% · Graham Platner 48.3%

Field dates
Mar 20–Mar 31, 2026
Sample
1,167 LV
Sponsor / client
Not reported in archive
Partisan sponsorship
No partisan sponsorship flag
Collins +3.1

Susan Collins 45% · Janet Mills 41.9%

Field dates
Mar 20–Mar 31, 2026
Sample
1,167 LV
Sponsor / client
Not reported in archive
Partisan sponsorship
No partisan sponsorship flag
Platner +4

Susan Collins 41% · Graham Platner 45%

Field dates
Oct 26–Oct 29, 2025
Sample
783 RV
Sponsor / client
Not reported in archive
Partisan sponsorship
No partisan sponsorship flag
Collins +4

Susan Collins 46% · Janet Mills 42%

Field dates
Oct 26–Oct 29, 2025
Sample
783 RV
Sponsor / client
Not reported in archive
Partisan sponsorship
No partisan sponsorship flag
See this pollster in the Full Poll Archive →
Certified-result history

Eligible historical observations

12 shown · 12 total

CycleRaceTypeField endSamplePollResultError
20162016_Pres-G_MEPres-G2016-10-25812D+6.0D+3.0D+3.0
20162016_Pres-G_M2Pres-G2016-10-25382R+1.7R+10.3D+8.6
20162016_Pres-G_M1Pres-G2016-10-25429D+12.8D+14.8R+2.1
20142014_Sen-G_MESen-G2014-11-01906R+20.1R+37.0D+16.9
20142014_House-G_ME-2House-G2014-11-01397R+0.9R+5.2D+4.3
20142014_House-G_ME-1House-G2014-11-01419D+25.3D+29.8R+4.5
20142014_Gov-G_MEGov-G2014-11-01906D+0.3R+4.8D+5.1
20122012_Pres-G_MEPres-G2012-11-02905D+11.1D+15.3R+4.2
20122012_Pres-G_M2Pres-G2012-11-02436D+4.0D+8.6R+4.6
20122012_Pres-G_M1Pres-G2012-11-02469D+17.7D+21.4R+3.7
20122012_House-G_ME-2House-G2012-11-02436D+4.0D+16.4R+12.4
20122012_House-G_ME-1House-G2012-11-02469D+28.0D+29.6R+1.6

Method · historical final-three-week D/R general-election rows plus verified historical supplement; min n=5

Definition · bias_D is poll D-R margin minus actual D-R margin; positive overstates Democrats.

A missing sample, sponsor or source is labeled unavailable; it is never reconstructed.

Poll data via VoteHub, used under CC BY 4.0. Poll data from The New York Times, used under CC BY 4.0.