VotePredictor
past elections

Iowa Senate

Patty Judge (D) vs Chuck Grassley (R)

Actual result
R+24.4
Final polls said
R+19.7
6 late polls · ✓
Model predicted
R+21.1
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+23.01.4
2VotePredictorR+21.13.4
3Emerson CollegeR+28.03.6
4SurveyMonkeyR+18.06.4
5Quinnipiac UniversityR+18.06.4
6Monmouth University Polling InstituteR+17.07.4
7Loras College Public Opinion Survey CenterR+16.28.2
8LucidR+12.012.4

Forecasters — pre-election win probability, scored by Brier

#ForecasterWin probBrierCalled
1Cook PoliticalRep 99%0.000
2FiveThirtyEightRep 100%0.000
3Inside ElectionsRep 99%0.000
4Sabato's Crystal BallRep 99%0.000
5VotePredictorRep 100%0.000

Polls (12)

PollsterDatenPollMiss
SurveyMonkey2016-11-041781R+18.06
Selzer & Co.2016-11-03800R+23.01
Loras College Public Opinion Survey Center2016-11-02500R+16.28
Emerson College2016-11-02700R+28.04
SurveyMonkey2016-10-28984R+15.09
Quinnipiac University2016-10-23791R+18.06
SurveyMonkey2016-10-121135R+16.08
Lucid2016-10-09917R+12.012
Selzer & Co.2016-10-05642R+17.07
Loras College Public Opinion Survey Center2016-09-21491R+17.17
Quinnipiac University2016-09-17612R+12.012
Monmouth University Polling Institute2016-09-13404R+17.07