I'm not surprised how MS's Catholic vote was more Republican than its Protestant vote...I've always said that my Catholic church is more Republican than First Baptist in my town. We once learned the 10 Commandments in Sunday School by talking about all the times that Bill Clinton violated them. I thought about saying how inappropriate that was, but instead I just stopped paying attention, as I usually did. Yep, Sunday School actually destroyed my Catholic faith rather than strengthening it.
Interesting...though I think another issue is that blacks in MS are mainly Protestant, thus making the Protestant vote more Democratic than the white Protestant vote. My guess would be that MS's white Protestants are quite Republican, though unfortunately CNN didn't poll that data in 2004.