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Pollster file

Mitchell Research & Communications

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
54
Mean absolute error
4.64percentage points
Historical bias
D+1.16
Represented cycles
121998–2024
Current archive
47canonical records
History span
Oct 21, 1998through Nov 2, 2024
Identity

Known names and relationships

Known aliases
Mitchell Research
Organization type
Single canonical organization
Cycles represented
1998 · 2000 · 2002 · 2004 · 2008 · 2012 · 2014 · 2016 · 2018 · 2020 · 2022 · 2024

54 eligible historical polls across 12 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 · 47 total

Benson +8

Don't know 8% · Perry Johnson 42% · Jocelyn Benson 50%

Field dates
Jun 11–Jun 13, 2026
Sample
827 LV
Sponsor / client
MIRS News Service
Partisan sponsorship
No partisan sponsorship flag
El-Sayed +5

Don't know 11% · Mike Rogers 42% · Abdul El-Sayed 47%

Field dates
Jun 11–Jun 13, 2026
Sample
827 LV
Sponsor / client
MIRS News Service
Partisan sponsorship
No partisan sponsorship flag
Benson +12

Don't know 15% · Mike Duggan 13% · John James 30% · Jocelyn Benson 42%

Field dates
May 1–May 7, 2026
Sample
606 LV
Sponsor / client
MIRS News Service
Partisan sponsorship
No partisan sponsorship flag
Primary · R primary

Michigan · Governor

James +9

John James 32% · Perry Johnson 23% · Aric Nesbitt 7%

Field dates
May 7, 2026
Sample
400 LV
Sponsor / client
Not reported in archive
Partisan sponsorship
No partisan sponsorship flag
Rogers +2

Don't know 18% · Mallory McMorrow 41% · Mike Rogers 43%

Field dates
May 1–May 7, 2026
Sample
606 LV
Sponsor / client
MIRS News Service
Partisan sponsorship
No partisan sponsorship flag
Benson +10

Don't know 13% · Mike Duggan 13% · Perry Johnson 32% · Jocelyn Benson 42%

Field dates
May 1–May 7, 2026
Sample
606 LV
Sponsor / client
MIRS News Service
Partisan sponsorship
No partisan sponsorship flag
Primary · D primary

Michigan · Governor

Benson +54

Jocelyn Benson 62% · Christopher Robert Swanson 8%

Field dates
May 7, 2026
Sample
405 LV
Sponsor / client
Not reported in archive
Partisan sponsorship
No partisan sponsorship flag
Rogers +3

Don't know 19% · Haley Stevens 39% · Mike Rogers 42%

Field dates
May 1–May 7, 2026
Sample
606 LV
Sponsor / client
MIRS News Service
Partisan sponsorship
No partisan sponsorship flag
Benson +11

Don't know 15% · Mike Duggan 14% · Mike Cox 30% · Jocelyn Benson 41%

Field dates
May 1–May 7, 2026
Sample
606 LV
Sponsor / client
MIRS News Service
Partisan sponsorship
No partisan sponsorship flag
Rogers +1

Don't know 17% · Mike Rogers 42% · Abdul El-Sayed 41%

Field dates
May 1–May 7, 2026
Sample
607 LV
Sponsor / client
MIRS News Service
Partisan sponsorship
No partisan sponsorship flag
Primary · D primary

Michigan · Senate

El-Sayed +9

Abdul El-Sayed 27% · Haley Stevens 18%

Field dates
May 7, 2026
Sample
405 LV
Sponsor / client
Not reported in archive
Partisan sponsorship
No partisan sponsorship flag
Primary · D primary

Michigan · Governor

Benson +36

Jocelyn Benson 48% · Garlin Gilchrist 12% · Christopher Robert Swanson 5%

Field dates
Nov 21, 2025
Sample
261 LV
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

50 shown · 54 total

CycleRaceTypeField endSamplePollResultError
2024MI · PresidentPres-G2024-11-02—D+1.5R+1.4D+2.9
2024MI · PresidentPres-G2024-10-29—R+1.0R+1.4D+0.4
2024AZ · PresidentPres-G2024-10-28—R+2.0R+5.5D+3.5
20222022_Sen-GR_GASen-G2022-12-04625D+5.0D+2.8D+2.2
20222022_Gov-G_MIGov-G2022-11-03658D+2.0D+10.5R+8.5
20222022_House-G_MI-7House-G2022-11-02402R+0.9D+5.4R+6.3
20222022_Gov-G_MIGov-G2022-10-19541D+2.0D+10.5R+8.5
20202020_Sen-G_MISen-G2020-10-29817D+5.4D+1.7D+3.7
20202020_Pres-G_MIPres-G2020-10-29817D+7.1D+2.8D+4.3
20202020_Sen-G_MISen-G2020-10-26759D+9.6D+1.7D+7.9
20202020_Pres-G_MIPres-G2020-10-26759D+10.4D+2.8D+7.6
20202020_Sen-G_MISen-G2020-10-18900D+6.0D+1.7D+4.3
20202020_Pres-G_MIPres-G2020-10-18900D+10.0D+2.8D+7.2
20182018_Sen-G_MISen-G2018-11-05827D+3.0D+6.5R+3.5
20182018_Gov-G_MIGov-G2018-11-05827D+7.8D+9.6R+1.8
20182018_Sen-G_MISen-G2018-11-04701D+7.0D+6.5D+0.5
20182018_Gov-G_MIGov-G2018-11-04701D+14.0D+9.6D+4.4
20182018_Sen-G_MISen-G2018-10-25400D+6.0D+6.5R+0.5
20182018_Gov-G_MIGov-G2018-10-25400D+5.0D+9.6R+4.6
20162016_Pres-G_MIPres-G2016-11-061,011D+6.0R+0.2D+6.2
20162016_Pres-G_MIPres-G2016-11-031,007D+5.0R+0.2D+5.2
20162016_Pres-G_MIPres-G2016-11-021,150D+4.0R+0.2D+4.2
20162016_Pres-G_MIPres-G2016-11-01887D+4.0R+0.2D+4.2
20162016_Pres-G_MIPres-G2016-10-31737D+6.5R+0.2D+6.7
20162016_Pres-G_MIPres-G2016-10-30953D+7.3R+0.2D+7.5
20162016_Pres-G_MIPres-G2016-10-251,030D+6.0R+0.2D+6.2
20162016_Pres-G_MIPres-G2016-10-231,241D+8.0R+0.2D+8.2
20162016_Pres-G_MIPres-G2016-10-181,102D+12.5R+0.2D+12.7
20142014_Sen-G_MISen-G2014-11-021,224D+12.0D+13.3R+1.3
20142014_Gov-G_MIGov-G2014-11-021,2240R+4.1D+4.1
20142014_Sen-G_MISen-G2014-10-271,159D+14.1D+13.3D+0.8
20142014_Gov-G_MIGov-G2014-10-271,159R+4.9R+4.1R+0.8
20142014_Sen-G_MISen-G2014-10-19919D+13.6D+13.3D+0.3
20142014_Gov-G_MIGov-G2014-10-19919R+2.3R+4.1D+1.8
20142014_House-G_MI-11House-G2014-10-15472R+12.0R+15.4D+3.4
20122012_Sen-G_MISen-G2012-11-041,305D+14.0D+20.8R+6.8
20122012_Pres-G_MIPres-G2012-11-041,305D+5.0D+9.5R+4.5
20082008_Pres-G_MIPres-G2008-11-03400D+16.0D+16.5R+0.5
20082008_Pres-G_MIPres-G2008-10-28600D+14.0D+16.5R+2.5
20042004_Pres-G_MIPres-G2004-10-27600D+2.0D+3.4R+1.4
20042004_Pres-G_MIPres-G2004-10-23600D+1.0D+3.4R+2.4
20042004_Pres-G_MIPres-G2004-10-19400R+4.0D+3.4R+7.4
20022002_Sen-G_MISen-G2002-10-29600D+30.0D+22.7D+7.3
20022002_Gov-G_MIGov-G2002-10-29600D+13.0D+4.0D+9.0
20022002_Sen-G_MISen-G2002-10-22600D+34.0D+22.7D+11.3
20022002_Gov-G_MIGov-G2002-10-22600D+8.0D+4.0D+4.0
20022002_Sen-G_MISen-G2002-10-15600D+26.0D+22.7D+3.3
20022002_Gov-G_MIGov-G2002-10-15600D+12.0D+4.0D+8.0
20002000_Sen-G_MISen-G2000-11-01800R+3.0D+1.6R+4.6
20002000_Pres-G_MIPres-G2000-11-01800D+5.0D+5.1R+0.1

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.