In addition to the expected splits along gender, age, and race lines, there also seems to be a big split along denominational lines. According to CBS exit polls, Obama seems to be running poorly among Catholics. In CT, white Protestants went for Obama, 55-40, but white Catholics went for Clinton, 59-37.
(Interestingly, Jewish voters went for Obama by nearly 2:1 (62-37), putting to rest the idea that accusations that Obama is a closet Muslim would hurt him with Jewish voters.)
There are similar results in MA. Obama carried white Protestants 49-48, but Clinton carried white Catholics 62-35.
So much for the Kennedys helping with Catholic voters.
Update: Same in IL. Obama won white Protestants 62-36, but lost white Catholics 49-51.
Update Update: The same pattern holds in CA, but not in MO.