Nate Silver @NateSilver538
If we run the 2020 version of our model on 2016, it gives Clinton a 70% chance of winning the Electoral College, vs. 71%/72% in our actual final 2016 model (polls-only/polls-plus). So adding in 2016 data doesn't change much; it was a pretty normal-sized polling error. — PolitiTweet.org