He's obviously smart and good at what he does, but his personal bias (and what he wants out of politics: a rural, dumb, poor GOP vs. a cosmopolitan, educated Democratic Party ... which we all know is painfully simplistic) drips from his writing. Unfortunately, he's smart enough to "back it up" and not be obvious, but it's annoying.
I think he's gotten a lot less overtly partisan over the years. If you think he's like that now, take a look at what he was like before he worked for either ESPN or NYTimes, way back when FiveThirtyEight was its own website.
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