You are mistaken. Thompson, and Huckabee, and Romney, and McCain, and Paul, all say that states have the ultimate right to decide the abortion question.
Again, this is in direct opposition to the Reagan pro-life plank, which recognizes the personhood of the unborn, and their protection under the Fourteenth Amendment.
The Republican/Reagan pro-life plank is all well and good, but it isn't practical to expect it to become reality anytime soon. I'm talking about what could possibly be done in the real world to make a positive start toward the ultimate goal of banning abortion nationwide while greatly reducing the number of abortions in the process, not what should be done under the 14th amendment. AFAIK the 14th has not been held by any high court to protect the right to life of the unborn, and in practical terms it won't be unless and until a solid majority of pro-life USSC Justices takes control of the court.
If Giuliani or any Democrat is elected next year there won't be that solid majority for a long time to come, if ever. But I believe that either Fred, Hunter, or Huckabee would appoint Justices of that caliber if given the opportunity. I'm not sure about McCain, even though I think that he has always run for the Senate on a pro-life position.