Two things come to mind. First (and I don't know how true it is), some contemporary Catholics are not hard-line anti-abortion; second, at the end of the day you

Two things come to mind. First (and I don't know how true it is), some contemporary Catholics are not hard-line anti-abortion; second, at the end of the day you usually have a choice of D or R. You go with what lines up best. Voting for either one does not mean you lockstep agree with their position on every issue.