Nate Silver @NateSilver538
@DKarol @jonmladd @mattyglesias This is kind of an aside but it also seems relevant that the amount of useful data has increased quite a bit as a result of recent primary cycles. Of the 15 competitive primaries since 1980 (the data in '72 & '76 is mostly too spotty for rigorous work), 5 have occurred since '08. — PolitiTweet.org