According to the Pew Research Center, Catholics have voted pretty evenly for the Republican Presidential candidate and the Democratic candidates in ‘00 and ‘04. To be precise, Catholics voted 47%-50% Bush-Gore in 2000 and 52-47 Bush-Kerry in 2004.
Bush is pro-life. Gore and Kerry are both pro-abortion. The Catholic Church is pro-life. As it says in the Catechism:
Human life must be respected and protected absolutely from the moment of conception. From the first moment of his existence, a human being must be recognized as having the rights …