The Catholic social teaching also says that Catholics must be against the death penalty, but nobody seems to say that we must go against the death penalty to court Catholics in the US, probably because 'pro-life' Catholics aren't so consistent on their 'adherence' to the Church doctrine nor their professed 'pro-life' positions. It seems to me that anti-abortion positions mainly come from general social conservativism, and not out of any particular religious faith.
Moreover, one mustn't dismiss the pro-choice Catholics, who may in fact outnumber anti-abortion Catholics, judging by their behavior and not by what thye might say.
Besides, in my view, the Left should not adapt our programs and strategies to the teachings of any particular faith. It discriminates against people of other religious persuasions as well as atheists + agnostics.
Retreat from secularism is disastrous for women.
Yoshie