VotePredictor
past elections

Illinois House

Tammy Duckworth (D) vs Peter J. Roskam (R)

Actual result
R+2.7
Final polls said
D+1.6
5 late polls · ✗
Model predicted
D+2.9
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
1Richard Day ResearchR+4.01.3
2Market Shares Corp.R+4.01.3
3RT StrategiesD+1.03.7
4Normington, Petts & AssociatesD+1.03.7
5VotePredictorD+2.95.6
6GQRD+5.07.7
7Zogby AnalyticsD+14.016.7

Polls (8)

PollsterDatenPollMiss
Zogby Analytics2006-10-26500D+14.017
RT Strategies2006-10-25990D+1.04
Normington, Petts & Associates2006-10-23400D+1.04
Richard Day Research2006-10-21500R+4.01
Market Shares Corp.2006-10-16600R+4.01
RT Strategies2006-10-091000EVEN3
GQR2006-10-08409D+5.08
Zogby Analytics2006-09-29500D+5.08