While the Villagers seemed to object, and it didn't go well with the audience, I was quite pleased with Obama's response that the question of when life begins is above his pay grade. I remember Pastor Tim Russert asking, I think, Claire McCaskill a similar question and she was like, "What are you asking? When does an embryo become ensouled?"
Believe what you want, but the important question for politicians is how such things get translated into... policy. And when McCain says he believes life begins at conception (cheer!) it's pretty meaningless unless he's asked to explain how that would be translated into policy. Are blastocysts entitled to child support? Do all late periods need to be reported to the Ministry of Health? And, of course, my favorite: Are those who implant multiple embryos during IVF treatments, knowing full well that most will die, guilty of negligent manslaughter?