As I see it, the only right in question regarding the entity in the womb is a Right to life. There is no other right that can have any meaning regarding that entity. (Basing the issue of abortion on a future existence of an entity in a womb that may or may not come to pass if a potential abortion is, well, aborted is, to my mind, pointless.)

Whether a Right to life exists is purely a belief (one I happen not to hold: the only reason it should be illegal for you to murder me is because I have Right to life?) At the same time, it is not necessary to believe in a Right to life to be against murder (How about the mere fact that I exist as a fellow human being?)--or abortion.

The point is that approaching the issue of abortion through 'rights' regarding the entity in the womb does nothing to remove the issue of abortion from the realm of personal beliefs. For that matter, I don't see how anything can possibly move it from there.

On the other hand, in the U.S. we are free to do whatever is not illegal. So the only question is whether abortion should be a crime. Personally, I believe that abortion is a sin, but that making it a crime is the community as a whole interceding way too much in the most personal aspect possible of the lives of individuals.