Human life is sacred, and should be treated as such. You should draw the line in the only safe place to draw the line: before conception.
Note that the US Supreme Court, in it's infinite wisdom, has drawn the line on the other end: birth. US federal law allows a baby to be ripped apart (literally) as it is being born, as long as it's not out past the navel. And the law explicitly states that if the baby accidentally gets out past the navel before they've successfully mutilated him/her, no crime has been committed because it was unintentional. (The atrocious murder is certainly intentional, so what they mean is that the slaughter of the baby is unintentionally completed after it's out past the navel.) You can't tell me that's not murder. Obama says that's only a small percentage of abortions. But I think if even one baby is slaughtered like that at birth, it should make national news. But it's normal for our country.
Also it's interesting that this question is only explored academically, without any video or even pictures of what abortion really is. I'm tempted to post a picture here but I'll refrain. But I'd like to see politicians debate this, with actual video and pictures. No one could defend it with a picture in front of them. But hey let's not look at what it really is.
Again, life is sacred and the only safe place to draw the line is before conception.