Why? It's an interesting question and Washington Post writers Don Balz and Scott Clement dig into exit polls from recent primary contests for insight. Their findings might not surprise the average Catholic in the pew. In a word, Santorum (and for that matter Newt Gingrich) is not representative of most Catholics, and there are far fewer presumptions about what it means to be Catholic and what that designation means in terms of voting preferences than once may have been the case.
Read the whole thing here.