Nate Silver @NateSilver538
@willwilkinson @gelliottmorris @mattyglesias You can test what best predicts the next poll or set of polls; I feel pretty strongly that this is the "correct" way to do it, FWIW. For many polling series (e.g. NH primary polls) you can also test what best predicts the result. Generally speaking, these give similar answers. — PolitiTweet.org