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

Public Policy Institute of California

Method: probability panel · scored polls from 1998 to 2024

Versus the field
+0.26
points of error vs. other pollsters in the same races, after shrinkage (unshrunk +1.02; 12% own record)
Average miss
6.4
points on the margin, as published
House effect
R+0.1
lean relative to other polls of the same races
Scored polls
40
20 races · 2 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
199849.3+0.4R+1.9
200043.52.4D+0.5
200224.1+0.5D+1.6
2003215.6+6.3D+8.0
200442.01.0D+1.0
200620.54.0R+4.0
200827.6+0.2R+0.8
201046.70.7R+0.2
2012210.1+4.1R+4.8
201422.5+0.8R+1.0
201629.1+2.4R+6.4
2018212.4+4.8R+5.2
202021.73.1R+3.9
202224.6+1.1D+1.7
202448.8+3.4D+3.9
This cycle

2026 polls in the database

EndedRaceMatchupAs published
Sep 10, 2026Governor CAXavier Becerra v. Steve HiltonD+22
Jul 6, 2026Governor CAXavier Becerra v. Steve HiltonD+25
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 15, 20242024 Senate, CAD+26D+17.7D+8.3D+4.4
Oct 15, 20242024 President, CAD+26D+20.1D+5.9D+5.5
Sep 9, 20242024 Senate, CAD+28D+17.7D+10.3D+4.4
Sep 9, 20242024 President, CAD+31D+20.1D+10.9D+5.5
Oct 23, 20222022 Governor, CAD+19D+18.4D+0.6D+3.0
Sep 11, 20222022 Governor, CAD+27D+18.4D+8.6D+3.0
Oct 18, 20202020 President, CAD+26D+29.2R+3.2D+2.2
Sep 13, 20202020 President, CAD+29D+29.2R+0.2D+2.2
Oct 21, 20182018 Governor, CAD+11D+23.9R+12.9R+7.2
Sep 18, 20182018 Governor, CAD+12D+23.9R+11.9R+7.2
Oct 18, 20162016 President, CAD+26D+30.1R+4.1R+2.8
Sep 13, 20162016 President, CAD+16D+30.1R+14.1R+2.8
Oct 16, 20142014 Governor, CAD+16D+19.9R+3.9R+0.4
Sep 12, 20142014 Governor, CAD+21D+19.9D+1.1R+0.4
Oct 18, 20122012 President, CAD+12D+23.1R+11.1R+5.3
Sep 13, 20122012 President, CAD+14D+23.1R+9.1R+5.3
Oct 14, 20102010 Senate, CAD+5D+10.0R+5.0R+5.5
Oct 14, 20102010 Governor, CAD+8D+12.9R+4.9R+7.6
Sep 23, 20102010 Senate, CAD+7D+10.0R+3.0R+5.5
Sep 23, 20102010 Governor, CAR+1D+12.9R+13.9R+7.6
Oct 16, 20082008 President, CAD+23D+24.1R+1.1R+6.8
Sep 13, 20082008 President, CAD+10D+24.1R+14.1R+6.8
Oct 19, 20062006 Governor, CAR+18R+17.0R+1.0D+3.5
Sep 17, 20062006 Governor, CAR+17R+17.0EvenD+3.5
Oct 14, 20042004 Senate, CAD+18D+19.9R+1.9R+1.2
Oct 14, 20042004 President, CAD+12D+9.9D+2.1R+0.7
Sep 16, 20042004 President, CAD+12D+9.9D+2.1R+0.7
Sep 16, 20042004 Senate, CAD+18D+19.9R+1.9R+1.2
Sep 13, 20032003 Governor, CAD+2R+17.1D+19.1D+7.6
Aug 12, 20032003 Governor, CAR+5R+17.1D+12.1D+7.6
Oct 11, 20022002 Governor, CAD+10D+4.9D+5.1D+2.5
Sep 16, 20022002 Governor, CAD+8D+4.9D+3.1D+2.5
Oct 15, 20002000 Senate, CAD+17D+19.3R+2.3R+4.1
Oct 15, 20002000 President, CAD+5D+11.8R+6.8R+4.0
Sep 8, 20002000 Senate, CAD+17D+19.3R+2.3R+4.1
Sep 8, 20002000 President, CAD+9D+11.8R+2.8R+4.0
Oct 3, 19981998 Senate, CAD+3D+10.0R+7.0R+7.2
Oct 3, 19981998 Governor, CAD+8D+19.6R+11.6R+7.5
Sep 4, 19981998 Senate, CAD+2D+10.0R+8.0R+7.2
Sep 4, 19981998 Governor, CAD+9D+19.6R+10.6R+7.5