Nate Silver @NateSilver538
I forgot how late the Santorum surge came in Iowa in 2012. It was really, really last-minute: he went from 7.7% in the RCP average on Dec. 27 to winning the caucuses (after a dispute over the vote count) on Jan. 3. https://t.co/vOU6OjWGqu — PolitiTweet.org