Let me repeat my views on abortion, in case people don't know what I have said. There are two conceptions of the career of humans which strike me as being positions a reasonable person could take. A reasonable person could take the view that the career of life of a human is defined by biological identity, which goes from conception to death. How one defines death on this view is difficult, since the brain death criteria used at the end of life would, if applied to the beginning of life, would say life begins with "brain birth," when brain activity begins.
The other view is to see the life of a person as a series of mental states, which means that taking the life of the person before mental states begin is morally different from interrupting the series of mental events. (Which, BTW, is what killing a sleeping or comatose person would do). This does comport with the "brain death" view of death. It has the disadvantage of making the beginning of life more difficult to define.
My point here is that each of these views has advantages, and neither of them seems provably wrong. I can't resolve the question conclusively one way or the other. I haven't endorsed the second criterion, I have just said that it's one of two plausible options. As I see it, we are in a position of reasonable doubt. Maybe you think you can dispel this doubt with some great argument. But so far, it seems to me to be above my pay grade.
But here the Deer Hunter argument comes into play. If you're deer hunting, and you are in doubt as to whether something is a deer or a person, don't shoot. (Maybe I should call this the quail hunter argument, in honor of Dick Cheney). So if someone is wondering whether to get an abortion or not, I would say that you may turn out to be killing a person, so without a very powerful moral reason to abort, don't do it.
When it comes to the legal side, however, I remember that we don't put people in jail if we can't prove their guilt beyond a reasonable doubt. We are willing to let people loose who have killed someone, if we aren't sure. Then I have to ask what effect it would have to actually outlaw abortion. If we knew for sure that all abortion were homicides, that would be one thing. But in the light of reasonable doubt concerning the status of the fetus, the attempt to discourage abortion should be through moral persuasion rather than the coercive power of government. In a different world I might see the legal situation differently, but under the circumstances, this may be the best we can do.
Except when it comes to late-term abortions. Those should be outlawed, period.
I wish the issue were clearer and easier than it is. I know for some of you this is an easy question. Maybe I am overlooking the obvious in some way. But that is how I see it.