That they can corral the Catholics.  Definitely some, but not all.

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From wiki:

Catholics represent the largest Christian denomination in America with about 65 million professing the faith in 2003. The 2001 census bureau estimates that 25.9% of the population of adults identify themselves as Catholics...It is even said that Catholics have represented up to 30% of the voting population in recent elections.

Traditionally, Catholic voters have voted more for the Democratic pary, opting for civil rights and social security. However, in recent decades, with civil rights for Catholics playing a lesser and lesser role, the Catholic vote is less uniform, and many voters are influenced through issues of abortion and gay marriage. This is coupled by the drifting apart of some Catholics from the church through questions of birth control usage and feminist issues. When it comes to personal issues such as marriage and the family, Catholics are generally considered conservative, but on issues concerning social justice, they are generally considered liberal.