Actually, it's one of the standard arguments. Its classic presentation (I can't remember who formulated it) is to imagine that you wake up in bed one day to find another human being (whom you've never seen before) hooked up to you intravenously. You're told that he is very sick, and requires the support of your healthy system until he gets better. When he gets better, in nine months or so, he'll be able to leave, but until then he'll die if you unplug yourself to leave the bed.
It's far from clear that you have an unavoidable duty to stay in the bed until he gets better, even though leaving will kill him. Even less likely is that the government has the legal right to force you to stay in the bed-- even if we can agree that you must stay in bed, it doesn't seem right that you should face a penalty if you leave. There are reasonable limits to the assistance with which one may be legally required to provide someone else, and staying in bed for nine months is probably not covered. At any rate, you couldn't reasonably be accused of murder if you decide to deny your parasite access to your body; on the other hand you'd still feel pretty rotten about it, and would probably call it an evil. This is the perspective in which pro-choice people generally find themselves.
If that person is connected to you because you did something stupid (Like having unprotected sex) that you knew could result in this, but did it anyway then in that situation all I have to say is "tough luck". Life sucks, but you still have to accept the consequences of your actions, and you can't kill human beings simply because you don't want to be inconvenienced.
Are you seriously suggesting that it's OK to kill human beings simply out of convenience? I assume that you aren't, and that you don't believe fetuses are humans - in which case this entire line of argument is irrelevant, as the only issue that matters is when a baby is truly a human being.
I not a big fan of Gun ownership, smoking in public places or listening to Rap music, but I'd prefer those activities to be legal than have the Government arbitrarily ban those things. And abortion is far more private than any of those other issues.
They aren't comparable. It's one thing to believe something is inadvisable, or not something you want for yourself - it's another to believe it is morally wrong.
In a personal example, at my school several friends of mine, quite recently have gotten tattoos. (Three of them within a week, without any apparent warning or reason) I'm not a tattoo person - I'm not a fan, and I'm not particularly enthused by these people I know getting them. I would never get one myself. However, this, like your dislike of rap music or smoking in public places, is a
personal objection, not a moral one. I
personally object to tattoos because I don't particularly like how they look, and I don't like the idea of getting one - not because I think they are inherently immoral. Abortion, however, is the killing of a human being and is inherently immoral, thus it is not a matter of personal preference, but of morality.
The only issue in the abortion debate is "When does this 'fetus' become a baby, a human being with all the rights a normal human would have?" Any other argument is frivolous and irrelevant.