Being pro choice sounds like a good thing, while pro abortion can mean only one thing.
For example, Barack calls himself pro choice, but he has voted against the Partial Birth abortion ban and also was against The Born Alive Victims Protection Act. I find it hard that anyone who has read Jill Stanek's account of babies who survive abortion being left to die http://www.godandscience.org/doctrine/stanek.html
would not be for supporting the Act. Even NARAL, an extreme pro abortion group supported it.
Calling yourself one thing over the other does nothing to change the end result of abortion...too many "choices" have died and too many women and men are suffering....