Americans dislike attacks on Planned Parenthood but overwhelmingly approve of the world's most prominent pro-life activist. Interesting.
Probably because they agree with the Pope on a wide range of other issues and his opposition to abortion is a minor strike against him in the favorable-unfavorable add up, and it's probably safe to say that a good number of pro-life people don't buy the hysteria about PP and recognize that PP provides valuable healthcare and family planning services despite some abortions.
Not really interesting when you realize people aren't single-issue voters.
In addition, taking a hard line against abortion has been a core part of Catholic doctrine on social matters since time immaterial. Not that most Americans agree with that stance, but it's kind of a given with the Church. Who seriously expects them to change on that?