VotePredictor
past elections

Iowa President

Joe Biden (D) vs Donald Trump (R)

Actual result
R+8.2
Final polls said
R+0.1
15 late polls · ✓
Model predicted
R+3.5
Winner
Rep

"Final polls said" averages polls from the last ~3 weeks — the call right before the vote, and how pollsters are rated. The model's prediction is walk-forward (trained only on earlier races).

Final rankings

How everyone who called this race did, ranked — VotePredictor shown inline (★).

Pollsters — each pollster's final poll vs the result

#PollsterFinal callMissCalled
1Selzer & Co.R+7.01.2
2David Binder ResearchR+6.02.2
3VotePredictorR+3.54.7
4SurveyMonkeyR+3.05.2
5Data for ProgressR+2.06.2
6Garin-Hart-Yang Research GroupR+2.06.2
7InsiderAdvantageR+1.76.5
8Emerson CollegeR+1.27.0
9Quinnipiac UniversityR+1.07.2
10Change ResearchEVEN8.2
11RMG ResearchEVEN8.2
12YouGovEVEN8.2
13Public Policy PollingD+1.09.2
14CiviqsD+1.09.2
15National ResearchD+2.010.2
16The New York Times/Siena CollegeD+3.011.2
17RABA ResearchD+4.012.2
18Monmouth University Polling InstituteD+5.013.2

Forecasters — pre-election win probability, scored by Brier

#ForecasterWin probBrierCalled
1VotePredictorRep 77%0.055
2Elections DailyRep 75%0.062
3Sabato's Crystal BallRep 75%0.062
4Race to the WHRep 67%0.109
5Princeton Election ConsortiumRep 62%0.144
6CNalysisRep 60%0.160
7FiveThirtyEightRep 60%0.160
8DDHQ/Decision DeskRep 56%0.194
9The EconomistRep 55%0.202
10JHK ForecastsRep 55%0.202
11Cook PoliticalDem 50%0.250
12Inside ElectionsDem 50%0.250
13RealClearPoliticsDem 50%0.250

Polls (28)

PollsterDatenPollMiss
Public Policy Polling2020-11-01871D+1.09
Change Research2020-10-311084EVEN8
Civiqs2020-10-31853D+1.09
Emerson College2020-10-30604R+1.27
InsiderAdvantage2020-10-30400R+1.76
Data for Progress2020-10-29951R+2.06
Selzer & Co.2020-10-28814R+7.01
SurveyMonkey2020-10-261489R+3.05
Quinnipiac University2020-10-251225R+1.07
RABA Research2020-10-23693D+4.012
Emerson College2020-10-20435D+0.18
The New York Times/Siena College2020-10-19753D+3.011
InsiderAdvantage2020-10-18400D+0.59
RMG Research2020-10-18800EVEN8
Monmouth University Polling Institute2020-10-17501D+5.013
David Binder Research2020-10-12200R+6.02
Data for Progress2020-10-10822R+1.07
YouGov2020-10-081035EVEN8
National Research2020-10-07800D+2.010
SurveyMonkey2020-10-062539EVEN8
Civiqs2020-10-05756D+1.09
Quinnipiac University2020-10-031205D+5.013
Garin-Hart-Yang Research Group2020-09-26400R+2.06
Data for Progress2020-09-25743R+3.05
RABA Research2020-09-25780D+2.010
Monmouth University Polling Institute2020-09-20402R+3.05
The New York Times/Siena College2020-09-19501D+3.011
Selzer & Co.2020-09-16658EVEN8