I am opposed to all abortions, but I would be willing to start with: Outlaw abortion except for cases involving rape, incest, or the life of the mother is in danger.  That would be a great start, and St. John Paul II said incremental change is morally permissible.  That would eliminate 95% of abortions, and probably 60-70% of Americans could accept this compromise at this time; only the hardcore pro-lifers and the hardcore pro-abortion crowd would reject this compromise.