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Nate Cohn @Nate_Cohn
You can see both the magnitude of systemic bias in this chart, along with the case that there's a trend toward greater systemic bias. And fwiw, I think the D+5 bias is probably mitigated by some 'nonpartisan' firms that, tbh, aren't so nonpartisan or above the board https://t.co/SIYr8lXMop — PolitiTweet.org