VotePredictor
past elections

Delaware Senate

Joe Biden (D) vs Christine O'Donnell (R)

Actual result
D+29.4
Final polls said
D+30.5
2 late polls · ✓
Model predicted
D+34.2
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
1YouGovD+27.02.4
2SurveyUSAD+34.04.6
3VotePredictorD+34.24.8
4West Chester UniversityD+36.06.6
5Fairleigh Dickinson UniversityD+43.013.6

Polls (5)

PollsterDatenPollMiss
SurveyUSA2008-10-27657D+34.05
YouGov2008-10-25346D+27.02
West Chester University2008-10-07429D+36.07
SurveyUSA2008-09-22703D+32.03
Fairleigh Dickinson University2008-09-19601D+43.014