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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
62canonical 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 2026-09-09 · bundled copy. Archive records may be newer than the sealed forecast; inclusion here does not mean the forecast uses them.

12 shown · 62 total

Duggan +27.8

Don't know 11.6% · Someone else 1% · Mike Duggan 57.6% · John James 29.8%

Field dates
Jan 27–Feb 2, 2026
Sample
Not reported LV
Sponsor / client
Detroit Regional Chamber
Partisan sponsorship
No partisan sponsorship flag
Duggan +21.9

Don't know 12.5% · Someone else 2.2% · Mike Duggan 53.6% · Jocelyn Benson 31.7%

Field dates
Jan 27–Feb 2, 2026
Sample
Not reported LV
Sponsor / client
Detroit Regional Chamber
Partisan sponsorship
No partisan sponsorship flag
Benson +3

Aric Nesbitt 24% · Mike Duggan 32% · Jocelyn Benson 35%

Field dates
Jan 2–Jan 6, 2026
Sample
600 LV
Sponsor / client
Detroit News | WDIV-TV
Partisan sponsorship
No partisan sponsorship flag
Benson +3

Mike Cox 28% · Mike Duggan 31% · Jocelyn Benson 34%

Field dates
Jan 2–Jan 6, 2026
Sample
600 LV
Sponsor / client
Detroit News | WDIV-TV
Partisan sponsorship
No partisan sponsorship flag
Rogers +0.4

Don't know 11.9% · Haley Stevens 43.7% · Mike Rogers 44.1%

Field dates
Jan 2–Jan 6, 2026
Sample
600 LV
Sponsor / client
Detroit News | WDIV-TV
Partisan sponsorship
No partisan sponsorship flag
Rogers +3.3

Don't know 11.7% · Mike Rogers 45.7% · Mallory McMorrow 42.4%

Field dates
Jan 2–Jan 6, 2026
Sample
600 LV
Sponsor / client
Detroit News | WDIV-TV
Partisan sponsorship
No partisan sponsorship flag
Benson +2

John James 45% · Jocelyn Benson 47%

Field dates
Jan 2–Jan 6, 2026
Sample
600 LV
Sponsor / client
Detroit News | WDIV-TV
Partisan sponsorship
No partisan sponsorship flag
Rogers +6.4

Don't know 10.2% · Mike Rogers 48% · Abdul El-Sayed 41.6%

Field dates
Jan 2–Jan 6, 2026
Sample
600 LV
Sponsor / client
Detroit News | WDIV-TV
Partisan sponsorship
No partisan sponsorship flag
Benson +1

Tom Leonard 24% · Mike Duggan 33% · Jocelyn Benson 34%

Field dates
Jan 2–Jan 6, 2026
Sample
600 LV
Sponsor / client
Detroit News | WDIV-TV
Partisan sponsorship
No partisan sponsorship flag
James +2

Don't know 8% · Mike Duggan 26% · Jocelyn Benson 32% · John James 34%

Field dates
Jan 2–Jan 6, 2026
Sample
600 LV
Sponsor / client
Detroit News | WDIV-TV
Partisan sponsorship
No partisan sponsorship flag
Rogers +6.1

Don't know 12.3% · Abdul El-Sayed 40.8% · Mike Rogers 46.9%

Field dates
May 5–May 8, 2025
Sample
600 RV
Sponsor / client
Detroit Regional Chamber
Partisan sponsorship
No partisan sponsorship flag
Huizenga +0.5

Don't know 18.3% · Abdul El-Sayed 40.5% · Bill Huizenga 41%

Field dates
May 5–May 8, 2025
Sample
600 RV
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
20222022_Gov-G_MIGov-G2022-10-27600D+8.6D+10.5R+1.9
20222022_House-G_MI-7House-G2022-10-19400D+5.7D+5.4D+0.3
20202020_Sen-G_MISen-G2020-10-24600D+9.6D+1.7D+7.9
20202020_Pres-G_MIPres-G2020-10-24600D+7.7D+2.8D+4.9
20182018_Sen-G_MISen-G2018-10-26600D+16.7D+6.5D+10.2
20182018_Gov-G_MIGov-G2018-10-26600D+12.5D+9.6D+2.9
20142014_Sen-G_MISen-G2014-10-23600D+15.1D+13.3D+1.8
20142014_Gov-G_MIGov-G2014-10-23600R+5.0R+4.1R+0.9
20122012_Sen-G_MISen-G2012-10-28600D+14.9D+20.8R+5.9
20122012_Pres-G_MIPres-G2012-10-28600D+2.7D+9.5R+6.8
20122012_House-G_MI-3House-G2012-10-18400D+1.0R+8.4D+9.4
20102010_Gov-G_MIGov-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.