House Effects
Sunday, November 1, 20262 days until Election Day, November 3, 2026
Pollster record · how records are scored

Montana State University Billings

Method: live phone · scored polls from 2000 to 2024

Versus the field
+0.11
points of error vs. other pollsters in the same races, after shrinkage (unshrunk +0.79; 13% own record)
Average miss
5.6
points on the margin, as published
House effect
D+0.4
lean relative to other polls of the same races
Scored polls
33
33 races · 3 polls this cycle
By cycle

Record over time

Error relative to other pollsters in the same races (negative is better), and lean relative to them. Cycles with fewer than 10 scored polls are grayed: a handful of polls says little.

CyclePollsAvg. missVersus the fieldLean vs. field
200045.6+0.7D+5.6
200212.0−4.0D+8.0
200425.0+2.7D+6.1
200626.7+2.9D+2.1
200832.8−5.2D+4.3
201243.4−1.4R+3.4
201424.8+1.2D+2.2
201635.3−1.0R+1.2
201823.5+0.1D+3.1
2020411.3+2.5D+2.4
202225.8+2.2D+3.4
202446.3+3.9D+1.8
This cycle

2026 polls in the database

EndedRaceMatchupAs published
Oct 21, 2026MT-1Sam Forstag v. Aaron FlintD+17
Oct 21, 2026MT-2Brian Miller v. Troy DowningR+11
Oct 21, 2026Senate MTAlani Bankhead v. Kurt AlmeR+9
The receipts

Most recent scored polls

Polls in the final two months of a race with a certified result. “Others” is the average miss of other pollsters in the same race.

Poll dateRacePollResultMissOthers' miss
Oct 16, 20242024 Senate, MTEvenR+7.1D+7.1D+1.4
Oct 16, 20242024 President, MTR+18R+19.9D+1.9D+1.9
Oct 16, 20242024 House, MT-2R+17R+32.0D+15.0—
Oct 16, 20242024 Governor, MTR+19R+20.2D+1.2D+1.7
Oct 14, 20222022 House, MT-2R+26R+36.4D+10.4—
Oct 14, 20222022 House, MT-1R+2R+3.2D+1.2R+2.2
Oct 24, 20202020 Senate, MTD+1R+10.0D+11.0D+7.4
Oct 24, 20202020 President, MTR+7R+16.4D+9.4D+8.9
Oct 24, 20202020 House, MT-1R+1R+12.8D+11.8D+12.1
Oct 24, 20202020 Governor, MTEvenR+12.9D+12.9D+6.8
Oct 13, 20182018 Senate, MTD+9D+3.6D+5.4D+0.3
Oct 13, 20182018 House, MT-1R+3R+4.6D+1.6D+0.5
Oct 7, 20162016 Governor, MTD+12D+3.9D+8.1D+0.1
Oct 7, 20162016 President, MTR+16R+20.4D+4.4D+6.1
Oct 7, 20162016 House, MT-1R+19R+15.6R+3.4D+6.6
Oct 8, 20142014 House, MT-1R+7R+15.0D+8.0D+4.0
Oct 8, 20142014 Senate, MTR+16R+17.7D+1.6D+1.2
Sep 29, 20122012 House, MT-1R+13R+10.5R+2.5D+2.8
Sep 29, 20122012 Senate, MTR+3D+3.7R+6.6R+5.5
Sep 29, 20122012 Governor, MTR+2D+1.6R+3.8R+1.3
Sep 29, 20122012 President, MTR+15R+13.7R+0.8D+3.9
Oct 18, 20082008 House, MT-1R+34R+31.7R+2.2D+6.7
Oct 18, 20082008 Governor, MTD+33D+33.0R+0.1R+12.5
Oct 18, 20082008 President, MTD+4R+2.3D+6.3R+3.2
Oct 12, 20062006 Senate, MTD+11D+0.9D+10.1D+4.8
Oct 12, 20062006 House, MT-1R+23R+19.8R+3.3R+2.3
Oct 9, 20042004 Governor, MTD+14D+4.4D+9.6D+0.1
Oct 9, 20042004 President, MTR+21R+20.5R+0.5R+3.2
Oct 12, 20022002 Senate, MTD+33D+31.0D+2.0R+6.0
Oct 21, 20002000 House, MT-1R+2R+5.2D+3.2D+2.2
Oct 21, 20002000 Senate, MTD+2R+3.3D+5.3R+4.3
Oct 21, 20002000 Governor, MTD+3R+3.9D+6.9R+2.6
Oct 21, 20002000 President, MTR+18R+25.1D+7.1D+4.9