VotePredictor
past elections

Illinois Senate

Barack Obama (D) vs Alan Keyes (R)

Actual result
D+42.9
Final polls said
D+45.5
4 late polls · ✓
Model predicted
D+45.4
Winner
Dem

"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
1Scott Rasmussen (Rasmussen Reports)D+44.01.1
2VotePredictorD+45.42.5
3Victory ResearchD+46.03.1
4SurveyUSAD+39.03.9
5Market Shares Corp.D+47.04.1
6Richard Day ResearchD+50.07.1

Polls (8)

PollsterDatenPollMiss
Victory Research2004-10-301200D+46.03
SurveyUSA2004-10-28655D+39.04
Market Shares Corp.2004-10-18700D+47.04
Richard Day Research2004-10-17828D+50.07
SurveyUSA2004-10-05636D+45.02
Scott Rasmussen (Rasmussen Reports)2004-10-05500D+44.01
Market Shares Corp.2004-09-19700D+51.08
SurveyUSA2004-09-13608D+41.02