Nate Silver

Nate Silver @NateSilver538

That's the biggest bias in either direction in the cycles our pollster ratings cover (since 1998). It's likely that some earlier years, certainly 1980 and probably 1994, would have had a bigger bias if you extended back that far. So not unprecedented. But still ... not ... good. — PolitiTweet.org

Nate Silver @NateSilver538

don't think we should necessarily expect that polls will continue to have a anti-Republican bias. Historically, the direction of bias is not very predicable as pollsters adjust, adapt, etc. But I do think we may continue to see systematic polling errors in BOTH directions. https://t.co/qRvINCmkLN — PolitiTweet.org