12 final polls from 2010 to 2022 (average error 4.4 points): too few to grade. Crosstab grades every 2026 pollster on its own results after Election Day.
9 polls this cycle; its polls have been 2.3 points more Republican than other polls of the same races (raw gap R+3.9, adjusted for its 6 polls); spread 1.8× what its sample sizes predict (noisier than sampling explains).
| Date | Poll | Result | vs. other polls |
|---|---|---|---|
| 09-08 | Michigan Governor | Benson 47, James 43 | R+3.9 |
| 09-03 | Michigan Senate | El-Sayed 44, Rogers 46 | R+6.1 |
| 07-24 | Michigan Senate | El-Sayed 39, Rogers 49 | R+12.2 |
| 07-24 | Michigan Governor | Benson 44, James 39 | R+6 |
| 05-01 | Michigan Senate | El-Sayed 40, Rogers 45 | R+5 |
| 02-02 | Michigan Governor | Benson 45, James 41 | |
| 01-06 | Michigan Senate | El-Sayed 47, Rogers 43 | D+9.9 |
| 01-06 | Michigan Governor | Benson 47, James 45 | |
| 05-08 | Michigan Senate | El-Sayed 41, Rogers 47 |
States polled: Michigan.
Open Glengariff Group in the interactive Trust Index All pollster ratings
Glengariff Group has 12 final polls in the 1998–2022 results data, too few to receive a grade (at least 20 graded polls are needed). Its average error was 4.4 points.
Historically, Glengariff Group's misses leaned D+1.8 on average. In 2026 its polls have been 2.3 points more Republican than other polls of the same races. Lean describes how its numbers compare; it isn't an accusation of bias.
9 polls in Crosstab's data, including Michigan Governor, Michigan Senate.
Grades: Crosstab Trust Index, computed from FiveThirtyEight's pollster-ratings data (CC BY 4.0), 1998–2022; 2026 measures from Crosstab's polling data.
Updated 2026-10-04 · Crosstab, nonpartisan polling analysis.