I haven't seen this expressed directly, so I'm just throwing this idea out here.
Is the difference between Bush voters and Kerry voters their objects of fear? I think 9/11 has hit Bush voter's world view a lot harder than it hit those of liberals/cosmopolitan people. A lot of liberals have absorbed the lessons of the civil rights era and Vietnam, and learned that Americans have much to fear from themselves. We know that our actions as a nation can be wrong. So the hatred and fear behind 9/11 was a little easier for us to understand.
Thus, Kerry voters find Bush's bungling and overreaching in Iraq to be obvious and scary. They're also more willing to believe that terrorism is a crime and can be contained through policing actions.
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