On what issue? Catholics have always been ferociously anti-communist forever. And voting Republican does not mean voting right on issues. Cathoilics supported the Vietnam War under Kennedy , Johnson, and Nixon. They supported Nixon over McGovern in 1972. Until 1976, the Republican Party was the pro-abortion party. Gerald Ford was more pro-abortion than Carter.
Catholics gave us Vietnam and the third world conquest of our nation, they put Kennedy in office, they tried to put Humphrey in office, they kept Roosevelt in office, Carter, Clinton, Clinton, Gore, Obama, Catholics vote liberal.
Obama sits in that office today with 55% of Protestants having voted against him, while Catholics gave him a solid 54%, even Hispanics that are Protestant only gave him 52% of their vote.