Wisconsin is not a "conservative state." That's what made the Scott Walker victory there so remarkable.
The public employee unions are much less popular than Obama. Even when Walker was winning exit polls showed a significant number of ticket splitters - people who voted for Walker but who intended to vote for Obama six months later. Conservatives scoffed but it turned out to predict the result perfectly well, not unlike the vote in Michigan (reelect Obama but don’t write union goldbricking into the State Constitution).