"Did I request thee, Maker, from my clay
To mould me Man, did I solicit thee
From darkness to promote me?"
I don't know if anyone feels particularly GUNG-HO about abortion, but it's a convenience I as a man am glad exists. If my girlfriend got knocked up, it wouldn't be as simply as, "Oh well let's go get you an abortion right quick!" It would probably be a long, painful conversation. I can only imagine how much more severe it would feel being on the woman's side.
I won't argue for when life begins and all that jazz. It's a distraction from what the real issue is, I think. America's birthrate is pretty fantastic so I think it's easy to forget that childbirth is fucking dangerous and causes drastic changes to your body. Telling a woman she has to go through that is pretty fucked, when it's her body. If we outlaw abortion, will she become a murderer if she drinks too much and the baby is stillborn? Will someone else be a murderer if he punches her in the stomach? Will these women who are unable financially or emotionally to care for a baby not seek out any of the more ancient methods of abortion to get rid of it? Or turn to dangerous home-made abortion devices like coathangers? And that's not discussing the whole rape/incest thing.
All in all, I think it's too much of a case-by-case basis to say whether abortion is right or wrong, and it's not something the government should tell you you can't do for reasons provided.