Mitt Romney may have won the Illinois primary by a wide margin Tuesday night, but it was not a knockout, and Rick Santorum will live to fight another day. Even so, the conventional wisdom is that this contest was the beginning of the end.

The Illinois results underlined the clear trend emerging around Romney voters: They are less religious, they are college-educated and economically better off than the average Republican primary voter.

Romney won because there are more voters that fit this profile in Illinois than there were in the Southern states where Santorum prevailed. But those high-wealth voters have come with a high price tag.

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