Pollster · 55 of 1053

Mitchell Research

GRADE A− NEUTRAL LEAN
↗ Wikipedia
Polls scored
50
Mean error
3.7 pt
Signed bias
±0
Aggregation weight
1.09
Composite quality score
0–100 · weighted of 6 components
69
of 100 · tier · strong

Strong on the components we measure; one or two areas pull the composite below the elite threshold.

Aggregator weight 55
Verification rate 46
Sample size median 82
Citation rate 100
Outlier rate (inv.) 100
Rater alignment 72
Pollster vs editorial consensus
r-lean

Across 26 graded races, Mitchell Research's released topline differed from the median editorial-rater consensus by an average of -2.8pp. That's a measurable R-lean vs the consensus.

Mean delta
-2.8pp
Median delta
-1.8pp
Std-dev
5.1pp
N graded
26
Sample races (links to detail):
us-governor-2026-mius-senate-2024-mius-senate-2024-mi
Recent activity
Total all time
50
Last 30d
0
Last 90d
0
Last 180d
1

Last poll 11/21/2025 (169d ago) · status slow

Per-cycle debrief appearances
Cycle Rank Polls MAE Signed bias
2020 #8 / 20 3 4.99 pt D+4.99 pp
2018 #4 / 25 6 2.68 pt R+1.03 pp
2014 #3 / 21 4 2.53 pt D+2.06 pp
Recent polls