A common argument for legalized abortion is that abortion is sometimes necessary to save the life of the mother. Even Mitt Romney makes this claim as he favors the legality of abortion in the cases of rape, incest, and when the life of the mother is at risk.
According to the following video from the Life Institute, this argument is not valid. While doctors may do everything they can to save the life of the mother, even if it risks the life of the baby, this is not the same as murdering the child in the womb since there is no intention to harm the unborn baby.
It is never OK to murder a child in the womb or outside the womb. No exceptions.