For those who can't get their head around the issue of abortion constituting the killing or even murder of another person/potential person/proto-person etc.:
This is not really the intent, though, is it? Women do not have abortions in order to kill off their foetuses. I think a more sensible way of looking at this is to say that a woman who has an abortion is declining to put her body at the disposal of the foetus any longer.
Granted, the foetus does need her body in order to survive. There is a definite qualitative difference, though, between deliberately killing and declining to inconvenience oneself - in whichever way(s) - in order to enable somebody/something else to live.
For example, we do not mandate organ donation in our society. Not even when a) the organ in question is not necessary for our own survival (e.g. a kidney) and b) the potential donor is the only donor capable of saving a patient's life.
In fact, we consider it completely acceptable to continue to refuse our organs to someone who may need them for survival even after we are dead and therefore have absolutely no conceivable use for them.
Even if we are directly to blame for the dying patient's situation, e.g. if I cause a car accident in which someone else suffers irreparable injury to their kidneys, our society does not say that we must donate our organs.
I'm not arguing that it is not nice or good to be an organ donor. What I am saying is that in our society we apparently do respect bodily integrity and the right to self-determination above others' right to life in some instances. Of course it's bound to be controversial where women's rights to their bodies are concerned - as always.