Some clear thinking from Ed Morrissey at Hot Air.
I am following up on earlier posts.
Many Catholics maneuver around this by simply ignoring it, and they’re free to do so. Membership in the Church is voluntary, after all, and people can leave the Catholic Church if they disagree with its catechism (and strictly speaking, they should do so under those circumstances). However, it’s either a gross misrepresentation or self-delusion to argue that abortion is simply one issue among many for observant Catholics and that economic policy or foreign affairs can outweigh it.
His earlier post is on the mark as well.
It remains to be seen how far Catholics like Doug Kmiec will push the envelope, and how long it will be before canon 915 is actually enforced.
From mealy-mouthed “Catholic” politicians and political advisors, deliver us, O Lord.
Mary Victrix 
You mean we, as Catholics, don’t get to pick and choose what is appealing to us? You mean we cannot go through the motions to look and smell like Catholics but we actually must BE Catholic? Hmmm.