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Pollster file

Glengariff Group

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
13
Mean absolute error
4.44percentage points
Historical bias
D+1.06
Represented cycles
72010–2024
Current archive
49canonical records
History span
Oct 26, 2010through Oct 24, 2024
Identity

Known names and relationships

Known aliases
Glengariff Group, Inc.
Organization type
Single canonical organization
Cycles represented
2010 · 2012 · 2014 · 2018 · 2020 · 2022 · 2024

13 eligible historical polls across 7 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 2026-10-24. Archive records may be newer than the sealed forecast; inclusion here does not mean the forecast uses them.

12 shown · 49 total

Rogers +1.4

Don't know/Someone else 9.4% · Mike Rogers 45.8% · Abdul El-Sayed 44.4%

Field dates
Aug 31–Sep 3, 2026
Sample
600 LV
Sponsor / client
Detroit News | WDIV-TV
Partisan sponsorship
No partisan sponsorship flag
Benson +4

Don't know/Someone else 10% · John James 43% · Jocelyn Benson 47%

Field dates
Aug 31–Sep 3, 2026
Sample
600 LV
Sponsor / client
Detroit News | WDIV-TV
Partisan sponsorship
No partisan sponsorship flag
Benson +10.3

Jocelyn Benson 47.7% · Perry Johnson 37.4%

Field dates
Jul 22–Jul 24, 2026
Sample
600 LV
Sponsor / client
Business Leaders for Michigan · Michigan Education Association
Partisan sponsorship
No partisan sponsorship flag
Stevens +0.8

Haley Stevens 45.5% · Mike Rogers 44.7%

Field dates
Jul 22–Jul 24, 2026
Sample
600 LV
Sponsor / client
Business Leaders For Michigan · Michigan Education Association
Partisan sponsorship
No partisan sponsorship flag
Benson +5

John James 38.7% · Jocelyn Benson 43.7%

Field dates
Jul 22–Jul 24, 2026
Sample
600 LV
Sponsor / client
Business Leaders for Michigan · Michigan Education Association
Partisan sponsorship
No partisan sponsorship flag
Rogers +10.3

Abdul El-Sayed 38.7% · Mike Rogers 49%

Field dates
Jul 22–Jul 24, 2026
Sample
600 LV
Sponsor / client
Business Leaders For Michigan · Michigan Education Association
Partisan sponsorship
No partisan sponsorship flag
Swanson +3.2

Don't know 13.8% · Someone else 2.4% · Perry Johnson 40.3% · Chris Swanson 43.5%

Field dates
Jul 22–Jul 24, 2026
Sample
600 LV
Sponsor / client
Business Leaders for Michigan | Michigan Education Association
Partisan sponsorship
No partisan sponsorship flag
Swanson +3.6

Don't know 14.6% · Someone else 2.3% · John James 39.8% · Chris Swanson 43.4%

Field dates
Jul 22–Jul 24, 2026
Sample
600 LV
Sponsor / client
Business Leaders for Michigan | Michigan Education Association
Partisan sponsorship
No partisan sponsorship flag
Rogers +2.3

Don't know 14.7% · Someone else 0% · Haley Stevens 41.5% · Mike Rogers 43.8%

Field dates
Apr 28–May 1, 2026
Sample
600 LV
Sponsor / client
Detroit Regional Chamber
Partisan sponsorship
No partisan sponsorship flag
Rogers +4.9

Don't know 15.5% · Someone else 0% · Abdul El-Sayed 39.8% · Mike Rogers 44.7%

Field dates
Apr 28–May 1, 2026
Sample
600 LV
Sponsor / client
Detroit Regional Chamber
Partisan sponsorship
No partisan sponsorship flag
Benson +8

Don't know 15.3% · Someone else 1.3% · Mike Duggan 23.3% · Perry Johnson 26% · Jocelyn Benson 34%

Field dates
Apr 28–May 1, 2026
Sample
600 LV
Sponsor / client
Detroit Regional Chamber
Partisan sponsorship
No partisan sponsorship flag
Benson +5

Don't know 12.5% · Someone else 1.2% · Mike Duggan 23% · John James 29.2% · Jocelyn Benson 34.2%

Field dates
Apr 28–May 1, 2026
Sample
600 LV
Sponsor / client
Detroit Regional Chamber
Partisan sponsorship
No partisan sponsorship flag
See this pollster in the Full Poll Archive →
Certified-result history

Eligible historical observations

13 shown · 13 total

CycleRaceTypeField endSamplePollResultError
2024MI · PresidentPres-G2024-10-24—D+3.0R+1.4D+4.4
2022MI · GovernorGov-G2022-10-27600D+8.6D+10.5R+1.9
2022MI-7 · HouseHouse-G2022-10-19400D+5.7D+5.4D+0.3
2020MI · SenateSen-G2020-10-24600D+9.6D+1.7D+7.9
2020MI · PresidentPres-G2020-10-24600D+7.7D+2.8D+4.9
2018MI · SenateSen-G2018-10-26600D+16.7D+6.5D+10.2
2018MI · GovernorGov-G2018-10-26600D+12.5D+9.6D+2.9
2014MI · SenateSen-G2014-10-23600D+15.1D+13.3D+1.8
2014MI · GovernorGov-G2014-10-23600R+5.0R+4.1R+0.9
2012MI · SenateSen-G2012-10-28600D+14.9D+20.8R+5.9
2012MI · PresidentPres-G2012-10-28600D+2.7D+9.5R+6.8
2012MI-3 · HouseHouse-G2012-10-18400D+1.0R+8.4D+9.4
2010MI · GovernorGov-G2010-10-26600R+18.0R+18.2D+0.2

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.