He is a biased liberal and reading any of his commentary should be viewed through that lens. He doesn't even make much of an effort to hide it, in 2008 on 538 h

He is a biased liberal and reading any of his commentary should be viewed through that lens. He doesn't even make much of an effort to hide it, in 2008 on 538 he was basically rooting for Obama. However that doesn't mean his models are wrong. When they show that Republicans are going to win (or have improved), he states that just as clearly as when the same is true for Democrats.