There is a reason why the bishops don't talk tough to Catholic politicians who support legalizing abortion.  It's because abortion was not legalized by Congress.  It was legalized by the U.S. Supreme Court striking down state laws criminalizing abortion.  The only way to again criminalize abortion is to change the composition of the Supreme Court, a slow, indirect process since Justices are appointed for life.  This is the reason why, although I am socioeconomically liberal, I vote for Republican presidents  who are more likely to appoint pro-life justices. - whenever I can justify such a vote.  (lI voted Democratic in the last election.)