I think too many people do not understand that the question of "when human life begins" is a religious question, not a medical one, not a legal one nor a constitutional one. Rhetorical question: A vegetarian that will not eat meat derived from live animal eats an egg that was fertilized, does he eat meat? Rabbinical law is absolutely clear on that question, human life (ensoulment) begins with the first independent breath of the newborn, not before. A large body of rabbinical law that has to do with the choice between the life of the living mother and the "life" of the not yet living new born has come down unilaterally on the side of saving the living mother, not the not yet living newborn. Any federal law or state laws which seeks to undermine that body of religious law undermines the doctrine of separation between state and church.