
Nate Silver @NateSilver538
This is based on DW-Nominate, an algorithm that measures clusters of voting patterns in the U.S. Congress without knowing anything about the content of the legislation. It is an OK measure of *party-line voting in the US Congress* but NOT a very good one of left-right ideology. https://t.co/q507fOaVwl — PolitiTweet.org