Why do you guys like Schweitzer so much ? It's an actual question, since I don't know him at all.
I suspect it comes from a subconscious Democratic tendency to like candidates that can capture a wide range of support. Schweitzer may seem at first glance like a typical centrist Governor of a Western state, but he is a left-winger at heart. Democrats rise and fall on the basis of our candidates much more than Republicans do, and Schweitzer is very easygoing with a charming populist persona that can drag along voters that other Democrats might have a problem with.
Also he's been a really good Governor, which is always a plus.