House Effects
Monday, September 21, 202643 days until Election Day, November 3, 2026
Pollster record · how records are scored

Impact Research

Method: live phone mix · scored polls from 2004 to 2024 · 97% of scored polls were for a party or campaign

Versus the field
−0.02
points of error vs. other pollsters in the same races, after shrinkage (unshrunk +0.07; 27% own record)
Average miss
6.3
points on the margin, as published
House effect
R+0.1
lean relative to other polls of the same races
Scored polls
97
77 races · 29 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
200447.61.0D+1.2
200643.73.9D+0.2
2008185.72.2R+2.4
2010138.7+3.9D+3.8
2012135.8+1.5D+2.9
201437.9+1.0R+1.8
201510.25.4R+3.0
2016810.0+3.1D+0.4
201725.72.7R+3.7
2018123.12.5R+0.8
201927.7+3.4D+1.5
2020108.5+0.3R+2.2
202264.10.2R+4.8
202410.54.7R+5.0
This cycle

2026 polls in the database

EndedRaceMatchupAs published
Sep 12, 2026ME-2Matt Dunlap v. Paul LePageEven
Sep 2, 2026NY-21Blake Gendebien v. Anthony ConstantinoR+3
Aug 31, 2026FL-22Pia Dandiya v. Casey AskarD+2
Aug 24, 2026Senate SCAnnie Andrews v. Darline GrahamEven
Aug 24, 2026TN-5Chaz Molder v. Charlie HatcherR+8
Aug 17, 2026Senate SDBrian Bengs v. Mike RoundsEven
Aug 13, 2026Senate NEDan Osborn v. Pete RickettsEven
Aug 9, 2026WI-1Mitchell Berman v. Bryan SteilR+1
Jul 20, 2026IN-5J.D. Ford v. Victoria SpartzR+2
Jun 25, 2026AL-2Shomari Figures v. Rhett MarquesR+1
Jun 25, 2026MT-1Sam Forstag v. Aaron FlintEven
Jun 11, 2026PA-8Paige Cognetti v. Rob Bresnahan Jr.D+1
May 31, 2026NY-21Blake Gendebien v. Anthony ConstantinoR+1
May 31, 2026WI-3Rebecca Cooke v. Derrick Van OrdenD+4
May 28, 2026Senate MNPeggy Flanagan v. Michele TafoyaD+7
May 18, 2026Generic ballotD+8
Apr 12, 2026Senate MSScott Colom v. Cindy Hyde-SmithR+3
Mar 29, 2026Governor MIJocelyn Benson v. John JamesD+4
Mar 20, 2026Generic ballotD+4
Mar 17, 2026Senate TXJames Talarico v. Ken PaxtonD+1
Feb 17, 2026WI-3Rebecca Cooke v. Derrick Van OrdenD+1
Feb 16, 2026Governor MIJocelyn Benson v. John JamesD+3
Feb 5, 2026Senate NEDan Osborn v. Pete RickettsR+1
Jan 13, 2026Generic ballotD+4
Jul 28, 2025Governor OHAmy Acton v. Vivek RamaswamyR+1
Jul 11, 2025Senate MNPeggy Flanagan v. Michele TafoyaD+3
Jun 22, 2025Senate MSScott Colom v. Cindy Hyde-SmithR+13
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 3, 20242024 President, NER+20R+20.5D+0.5D+5.5
Oct 28, 20222022 Generic ballotD-ALIGNEDR+2R+2.6D+0.6D+3.0
Oct 16, 20222022 House, OH-1D-ALIGNEDD+3D+5.5R+2.5
Sep 21, 20222022 House, OH-1D-ALIGNEDD+3D+5.5R+2.5
Sep 19, 20222022 House, MT-1D-ALIGNEDR+2R+3.2D+1.2R+0.3
Sep 13, 20222022 House, FL-28D-ALIGNEDR+10R+27.4D+17.4
Sep 11, 20222022 House, IA-3D-ALIGNEDEvenR+0.7D+0.7D+2.6
Oct 21, 20202020 House, AR-2D-ALIGNEDEvenR+10.7D+10.7D+9.8
Oct 5, 20202020 Senate, SCD-ALIGNEDEvenR+10.3D+10.3D+7.4
Sep 29, 20202020 House, AR-2D-ALIGNEDEvenR+10.7D+10.7D+9.8
Sep 28, 20202020 Governor, NCD-ALIGNEDD+10D+4.5D+5.5D+5.9
Sep 28, 20202020 President, NCD-ALIGNEDD+3R+1.3D+4.3D+2.9
Sep 28, 20202020 Senate, NCD-ALIGNEDD+12R+1.7D+13.7D+6.0
Sep 23, 20202020 President, MID-ALIGNEDD+8D+2.8D+5.2D+4.5
Sep 20, 20202020 House, MI-3D-ALIGNEDD+2R+5.9D+7.9D+4.1
Sep 17, 20202020 House, NJ-2D-ALIGNEDD+5R+5.8D+10.3D+8.6
Sep 13, 20202020 House, AR-2D-ALIGNEDR+4R+10.7D+6.7D+9.8
Oct 3, 20192019 Governor, LAD-ALIGNEDD+16D+2.7D+13.3R+0.7
Jul 18, 20192019 House, NC-9D-ALIGNEDEvenR+2.0D+2.0D+5.1
Oct 28, 20182018 House, FL-27D-ALIGNEDD+10D+6.0D+4.0R+6.0
Oct 21, 20182018 Governor, MID-ALIGNEDD+11D+9.6D+0.9R+0.2
Oct 14, 20182018 House, FL-27D-ALIGNEDD+5D+6.0R+1.0R+6.0
Oct 14, 20182018 House, MI-11D-ALIGNEDD+10D+6.7D+2.8R+2.5
Oct 14, 20182018 Governor, MID-ALIGNEDD+10D+9.6D+0.4R+0.2
Oct 4, 20182018 House, MI-11D-ALIGNEDD+5D+6.7R+1.7R+2.5
Sep 30, 20182018 Governor, MID-ALIGNEDD+12D+9.6D+2.4R+0.2
Sep 25, 20182018 Governor, ILD-ALIGNEDD+16D+15.7D+0.3D+3.1
Sep 24, 20182018 Governor, SDD-ALIGNEDD+3R+3.4D+6.4D+4.5
Sep 20, 20182018 House, TX-31D-ALIGNEDR+4R+2.9R+1.1R+13.0
Sep 13, 20182018 Governor, MID-ALIGNEDD+7D+9.6R+2.6R+0.2
Sep 10, 20182018 House, MN-7D-ALIGNEDD+18D+4.3D+13.7
May 24, 20172017 House, SC-5D-ALIGNEDR+10R+3.1R+6.9R+8.6
Apr 25, 20172017 House, GA-6D-ALIGNEDD+1R+3.6D+4.6D+5.8
Oct 14, 20162016 House, CA-10D-ALIGNEDD+5R+3.4D+8.4D+0.5
Oct 12, 20162016 House, UT-4D-ALIGNEDR+10R+12.4D+2.5R+2.0
Oct 11, 20162016 House, VA-5D-ALIGNEDR+6R+16.7D+10.7D+9.6
Oct 11, 20162016 House, MI-1D-ALIGNEDD+1R+14.8D+15.8D+13.7
Oct 3, 20162016 House, FL-13D-ALIGNEDD+11D+3.8D+7.2D+4.7
Sep 29, 20162016 President, OHD+2R+8.1D+10.1D+7.6
Sep 29, 20162016 Senate, OHR+12R+20.9D+8.9D+5.8
Sep 12, 20162016 House, MI-1D-ALIGNEDD+2R+14.8D+16.8D+13.7
Oct 27, 20152015 Governor, LAD-ALIGNEDD+12D+12.2R+0.2R+1.1
Oct 8, 20142014 House, KS-2D-ALIGNEDR+10R+18.4D+8.4D+10.3
Oct 5, 20142014 House, KS-2D-ALIGNEDR+5R+18.4D+13.4D+10.3
Sep 23, 20142014 House, FL-2D-ALIGNEDD+3D+1.1D+1.9R+3.2
Oct 24, 20122012 Senate, IND-ALIGNEDD+7D+5.8D+1.2R+4.1
Oct 20, 20122012 House, FL-22D-ALIGNEDD+10D+9.3D+0.7R+6.7
Oct 20, 20122012 House, IL-13D-ALIGNEDD+9R+0.3D+9.3R+1.1
Oct 19, 20122012 Senate, AZD-ALIGNEDD+4R+3.0D+7.0D+0.9
Oct 17, 20122012 House, IL-8D-ALIGNEDD+15D+9.5D+5.5R+1.7
Oct 9, 20122012 House, OH-6D-ALIGNEDD+6R+6.5D+12.5D+2.4
Oct 3, 20122012 House, IL-17D-ALIGNEDD+1D+6.6R+5.6R+9.2
Sep 26, 20122012 House, NC-8D-ALIGNEDD+1R+7.8D+8.8D+2.7
Sep 24, 20122012 House, PA-12D-ALIGNEDD+11R+3.5D+14.5D+4.1
Sep 20, 20122012 Senate, AZD-ALIGNEDR+1R+3.0D+2.0D+0.9
Sep 14, 20122012 House, TX-23D-ALIGNEDD+5D+4.8D+0.2R+10.9
Sep 11, 20122012 House, OH-6D-ALIGNEDEvenR+6.5D+6.5D+2.4
Sep 10, 20122012 House, AZ-9D-ALIGNEDD+5D+4.1D+0.9R+4.0
Oct 27, 20102010 Senate, ILD-ALIGNEDD+2R+1.6D+3.6D+0.6
Oct 22, 20102010 Senate, ILD-ALIGNEDD+2R+1.6D+3.6D+0.6