"...because personhood is defined at the moment of birth."???
instead of citing your own opinions, please cite a source for this definition.
This issue transcends politics, imo, and even the law, but has to be decided through politics and the law. It should not be an easy thing to take a human life, or what will become a human life. Once you or your family loses a very young child, or an infant, I think it can change your thinking. I know it did for me. Nobody cares, but personally I am now against abortion, while politically I think it has to be allowed. The legal structure would follow.
An interesting take on this issue came from Carl Sagan, in of all publications, Parade magazine. Not sure of the year, but here are some quotes from what I believe to be a transcript of the article. My memory of the article is that he suggests the fetus becomes human once brain activity takes place.
http://2think.org/abortion.shtml
If we do not oppose abortion at some stage of pregnancy, is there not a danger of dismissing an entire category of human beings as unworthy of our protection and respect?
There is no right to life in any society on Earth today, nor has there been at any former time…
Those who assert a "right to life" are for (at most) not just any kind of life, but for--particularly and uniquely—human life. So they too, like pro-choicers, must decide what distinguishes a human being from other animals and when, during gestation, the uniquely human qualities--whatever they are--emerge.
But brain waves with regular patterns typical of adult human brains do not appear in the fetus until about the 30th week of pregnancy--near the beginning of the third trimester.
The woman's guarantee of privacy and the fetus's right to life must be weighed--and when the court did the weighing' priority was given to privacy in the first trimester and to life in the third.
Since, on average, fetal thinking occurs even later than fetal lung development, we find Roe v. Wade to be a good and prudent decision addressing a complex and difficult issue. With prohibitions on abortion in the last trimester--except in cases of grave medical necessity--it strikes a fair balance between the conflicting claims of freedom and life.