VotePredictor
past elections

Illinois House

Deborah Halvorson (D) vs Marty Ozinga (R)

Actual result
D+23.9
Final polls said
D+17.0
2 late polls · ✓
Model predicted
D+13.0
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
1Normington, Petts & AssociatesD+21.02.9
2Impact ResearchD+19.04.9
3SurveyUSAD+13.010.9
4VotePredictorD+13.010.9
5Public Opinion StrategiesD+2.021.9

Polls (5)

PollsterDatenPollMiss
SurveyUSA2008-10-20623D+13.011
Normington, Petts & Associates2008-10-15400D+21.03
Impact Research2008-10-12400D+19.05
Public Opinion Strategies2008-09-17400D+2.022
Impact Research2008-09-15400D+8.016