Paul Velleman at left2right has an interesting analysis of the exit poll data from the November presidential election.
(1) Discrepancies between exit polls and votes cannot be explained by random chance, so the discrepancies must have had a systematic cause.
(2) Explanations given by the exit pollsters are not statistically plausible.
(3) We don’t yet have an adequate explanation. Perhaps we’ll find one after the exit pollsters release their precinct-by-precinct data.