There's a philosophical-theological vote taking place in Missouri today.
From CNN: "Mississippi voters are casting ballots Tuesday on an amendment to the state constitution that would define life as beginning at the moment of conception.
Initiative 26 would define personhood as "every human being from the moment of fertilization, cloning or the functional equivalent thereof.""
I say "Yes."
The best single essay on this is Baylor U. philosopher Francis Beckwith's "The Nature of Humanness and Whether the Unborn Is a Moral Subject," in his book Defending Life: A Moral and Legal Case Against Abortion Choice.
See some of my comments on Beckwith here.