It is interesting how the Dems in Bush states tend to have better approval ratings than the Dems in Kerry states.
This doesn't seem too surprising to me: if you get elected in a state where you "shouldn't" have gotten elected, given your political party, there must be something good about you. On the other hand, if you get elected in a state in which you "should" have gotten elected, there's a much higher chance that you're only mediocre and that you got in because of your party and because you didn't screw up too badly.