My mother is very anti-abortion while also being a die hard straight ticket Democrat. Not all Catholics in her social circle are the same but many are. I can't say she has a political social circle, so maybe she is able to balance her beliefs because she isn't called on them. The issues her and her friends care about tend to be about extending entitlement programs, public education, assistance to immigrants, and things of a similar nature. For these the Democrats are much more inline with their views than Republicans, which is probably how she and other Catholics like her justify supporting the pro-choice political party despite being strongly against abortion.