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

Franklin & Marshall College Center for Opinion Research

Method: text/web mix · scored polls from 2004 to 2024

Versus the field
−0.06
points of error vs. other pollsters in the same races, after shrinkage (unshrunk +0.21; 19% own record)
Average miss
5.3
points on the margin, as published
House effect
D+0.4
lean relative to other polls of the same races
Scored polls
59
35 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
200494.81.5D+2.4
200686.10.3R+0.9
200876.1+1.0R+1.6
201086.0+1.6R+2.3
201241.52.0D+1.8
201427.0+2.6D+0.6
201668.3+3.6D+5.3
201844.9+1.6D+5.7
202034.42.7R+2.3
202242.72.4D+4.3
202443.70.0D+0.1
This cycle

2026 polls in the database

EndedRaceMatchupAs published
Aug 23, 2026Governor PAJosh Shapiro v. Stacy GarrityD+25
Jun 14, 2026Governor PAJosh Shapiro v. Stacy GarrityD+22
Mar 1, 2026Governor PAJosh Shapiro v. Stacy GarrityD+20
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 20, 20242024 Senate, PAD+1R+0.2D+1.2D+4.7
Oct 20, 20242024 President, PAR+1R+1.7D+0.7D+2.6
Sep 15, 20242024 Senate, PAD+8R+0.2D+8.2D+4.7
Sep 15, 20242024 President, PAD+3R+1.7D+4.7D+2.6
Oct 23, 20222022 Governor, PAD+22D+14.8D+7.2R+4.2
Oct 23, 20222022 Senate, PAD+4D+4.9R+0.9R+2.7
Sep 25, 20222022 Governor, PAD+14D+14.8R+0.8R+4.2
Sep 25, 20222022 Senate, PAD+3D+4.9R+1.9R+2.7
Oct 25, 20202020 President, PAD+6D+1.2D+4.8D+4.1
Oct 18, 20202020 House, PA-7D+7D+3.7D+3.5D+11.8
Sep 20, 20202020 President, PAD+6D+1.2D+4.8D+4.1
Oct 28, 20182018 Governor, PAD+26D+17.1D+8.9R+2.6
Oct 28, 20182018 Senate, PAD+15D+13.1D+1.9D+1.0
Sep 23, 20182018 Senate, PAD+17D+13.1D+3.9D+1.0
Sep 23, 20182018 Governor, PAD+22D+17.1D+4.9R+2.6
Oct 28, 20162016 Senate, PAD+12R+1.4D+13.4D+2.1
Oct 28, 20162016 President, PAD+11R+0.7D+11.7D+5.1
Sep 30, 20162016 President, PAD+9R+0.7D+9.7D+5.1
Sep 30, 20162016 Senate, PAD+6R+1.4D+7.4D+2.1
Sep 16, 20162016 Senate, COD+11D+5.7D+5.3D+4.2
Sep 16, 20162016 President, COD+7D+4.9D+2.1R+0.9
Oct 23, 20142014 Governor, PAD+7D+9.9R+2.9D+3.6
Sep 19, 20142014 Governor, PAD+21D+9.9D+11.1D+3.6
Oct 25, 20122012 Senate, PAD+9D+9.1R+0.1R+2.6
Oct 25, 20122012 President, PAD+4D+5.4R+1.4D+0.6
Sep 20, 20122012 Senate, PAD+10D+9.1D+0.9R+2.6
Sep 20, 20122012 President, PAD+9D+5.4D+3.6D+0.6
Oct 21, 20102010 Senate, PAR+8R+2.0R+6.0R+2.6
Oct 21, 20102010 Governor, PAR+16R+9.0R+7.0D+1.5
Oct 8, 20102010 House, PA-7R+3R+11.0D+8.0D+6.5
Oct 7, 20102010 House, PA-11R+7R+9.4D+2.4D+3.2
Sep 23, 20102010 Senate, PAR+9R+2.0R+7.0R+2.6
Sep 23, 20102010 Governor, PAR+4R+9.0D+5.0D+1.5
Sep 16, 20102010 House, PA-3R+6R+11.4D+5.4D+0.2
Sep 16, 20102010 House, PA-8R+14R+7.0R+7.0D+4.9
Oct 23, 20082008 President, PAD+13D+10.3D+2.7R+2.3
Oct 16, 20082008 PresidentD+5D+7.4R+2.4R+2.7
Oct 10, 20082008 House, PA-11R+5D+3.3R+8.3R+5.1
Oct 2, 20082008 House, PA-10D+15D+12.7D+2.3R+1.4
Sep 25, 20082008 President, PAD+5D+10.3R+5.3R+2.3
Sep 18, 20082008 PresidentR+2D+7.4R+9.4R+2.7
Sep 11, 20082008 House, PA-11R+9D+3.3R+12.3R+5.1
Oct 27, 20062006 Governor, PAD+25D+20.7D+4.3D+0.7
Oct 27, 20062006 Senate, PAD+15D+17.4R+2.4R+5.1
Oct 21, 20062006 House, PA-8R+9D+0.6R+9.6R+0.8
Oct 21, 20062006 House, PA-10D+12D+5.9D+6.1D+0.8
Sep 24, 20062006 House, PA-7D+1D+12.8R+11.8R+14.3
Sep 22, 20062006 House, PA-6R+3R+1.3R+1.7D+2.4
Sep 15, 20062006 Senate, PAD+7D+17.4R+10.4R+5.1
Sep 15, 20062006 Governor, PAD+18D+20.7R+2.7D+0.7
Oct 26, 20042004 House, PA-13D+18D+14.5D+3.5
Oct 21, 20042004 President, PAD+5D+2.5D+2.5R+0.8
Oct 21, 20042004 Senate, PAR+21R+10.6R+10.4R+8.9
Oct 2, 20042004 Senate, PAR+9R+10.6D+1.6R+8.9
Oct 2, 20042004 President, PAD+6D+2.5D+3.5R+0.8
Sep 18, 20042004 House, PA-13D+11D+14.5R+3.5
Sep 12, 20042004 President, PAEvenD+2.5R+2.5R+0.8
Sep 12, 20042004 Senate, PAR+26R+10.6R+15.4R+8.9
Sep 3, 20042004 House, PA-17D+20D+20.2R+0.2R+8.2