Certainly in the past many Catholics espoused the more social equality issues that have often been the foundation of the Democratic party. In recent times, or at least since Roe v. Wade, the abortion issue often plays the central role in candidate choice.
Here is an interesting recent article from the NY Times (http://www.nytimes.com/2008/10/05/us/politics/05catholic.html)about the topic.
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Here is an interesting recent article from the NY Times (http://www.nytimes.com/2008/10/05/us/politics/05catholic.html)about the topic.