Like Americans overall, U.S. Catholics are sharply divided by party - Pew Research Center

Politicians have long pursued the "Catholic vote" – a potentially big prize, given that the nation's roughly 51 million Catholic adults constitute the largest single religious institution in the United States. But while Catholics once were more likely to vote Democratic, they have never been monolithic politically...
http://www.pewresearch.org/fact-tank/2019/01/24/like-americans-overall-u-s-catholics-are-sharply-divided-by-party/