Republicans have made that case for decades--and failed to compel a majority of people in this country. The bottom line is that unintended pregnancy = slavery in the minds of a lot of women. And none of that is new thinking. I wonder how in heck the GOP ever thought they would defeat that kind of logic?
I think it has to be done outside of the political realm. Never rely on politicians to do what you want, they will let you down every time.