That's because the GOP, with candyasses like Specter, Collins, Whitman, etc. keep pushing the party to become more "tolerant" instead of drawing a line in the sand. The GOP elitists refuse to defend the pro-life movement and instead allow the opposition to set the debate. That's why you have the pro-baby killers running around saying they're pro-choice while the pro-lifers are "anti-choice." It's a bogus argument but the GOP has done a sorry job in this area.
Seems like that statement could be used for almost every issue, not just abortion.