Salon has an article on abortion training for doctors, which includes this quote:

"roughly half the women in the U.S. will undergo an abortion in their lifetime."

I find that remarkably difficult to believe (considering my recollection is that something like a third of women are against abortion except in the case of rape or threat to the mother's life, unfortunately I can't find any data on this looking on google), and, of course, since it is a news article it doesn't site its sources... Wondered if any of you had any thoughts on whether this number was plausible and whether you had seen any studies which came up with numbers like this.