VotePredictor
past elections

Iowa Senate

Bruce L. Braley (D) vs Joni K. Ernst (R)

Actual result
R+8.3
Final polls said
R+1.6
21 late polls · ✓
Model predicted
R+1.6
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
1Magellan StrategiesR+9.20.9
2Selzer & Co.R+7.01.3
3Gravis MarketingR+6.02.3
4Suffolk UniversityR+3.84.5
5Public Policy PollingR+3.05.3
6Marist CollegeR+3.05.3
7Øptimus AnalyticsR+2.95.4
8Big VillageR+2.06.3
9VotePredictorR+1.66.8
10Beacon Research/Shaw & Co. ResearchR+1.07.3
11Rasmussen ReportsR+1.07.3
12Monmouth University Polling InstituteR+1.07.3
13Quinnipiac UniversityEVEN8.3
14Garin-Hart-Yang Research GroupEVEN8.3
15IpsosEVEN8.3
16Harstad Strategic ResearchEVEN8.3
17YouGovD+1.09.3
18GQRD+1.09.3
19Loras College Public Opinion Survey CenterD+1.19.4

Polls (44)

PollsterDatenPollMiss
Public Policy Polling2014-11-021265R+3.05
Public Policy Polling2014-10-31617R+1.07
Selzer & Co.2014-10-30708R+7.01
Øptimus Analytics2014-10-302421R+2.95
Quinnipiac University2014-10-30778EVEN8
Beacon Research/Shaw & Co. Research2014-10-29911R+1.07
Big Village2014-10-29647R+2.06
Rasmussen Reports2014-10-29990R+1.07
YouGov2014-10-281112D+1.09
Garin-Hart-Yang Research Group2014-10-26802EVEN8
Ipsos2014-10-261129EVEN8
Quinnipiac University2014-10-24817R+4.04
Loras College Public Opinion Survey Center2014-10-231121D+1.19
Øptimus Analytics2014-10-232755R+3.15
Gravis Marketing2014-10-21964R+6.02
Monmouth University Polling Institute2014-10-20423R+1.07
YouGov2014-10-202322EVEN8
Marist College2014-10-20772R+3.05
Quinnipiac University2014-10-18964R+2.06
Øptimus Analytics2014-10-162455R+0.68
Public Policy Polling2014-10-15714D+1.09
Suffolk University2014-10-13500R+3.85
Quinnipiac University2014-10-10967R+2.06
Øptimus Analytics2014-10-093477R+4.14
Rasmussen Reports2014-10-09957R+3.05
Selzer & Co.2014-10-051000R+1.07
Magellan Strategies2014-10-031299R+9.21
Loras College Public Opinion Survey Center2014-10-02600R+0.38
Øptimus Analytics2014-10-022631R+1.07
Marist College2014-09-29778R+2.06
Gravis Marketing2014-09-29522R+9.01
GQR2014-09-27800D+1.09
Public Policy Polling2014-09-271192R+2.06
YouGov2014-09-262359D+0.49
GQR2014-09-26679R+1.07
Øptimus Analytics2014-09-252413D+0.89
Harstad Strategic Research2014-09-23809EVEN8
Selzer & Co.2014-09-23546R+6.02
Øptimus Analytics2014-09-182225R+1.27
Rasmussen Reports2014-09-17750EVEN8
Beacon Research/Shaw & Co. Research2014-09-15600EVEN8
Quinnipiac University2014-09-121167R+6.02
Øptimus Analytics2014-09-112714D+1.710
Big Village2014-09-09608D+1.09