When and how did abortion become a huge political "value" for right-wing evangelicals in the United States?

by lord-of-shalott

Overheard some of Joe Scarborough's show this morning and he kept repeating that right-wing evangelicals were pro-choice "when the Beatles broke up." It sounded like he was suggesting that one or two of the big evangelical leaders at the time decided abortion would be a useful tool in rallying voters, but I am curious as to whether they really wouldve been considered pro-choice back then, what evangelical theological perspectives on abortion were at the time, and how they started theologizing to the complete opposite end of the debate if it is true about the political shift. There is notoriously little in the Bible to graft onto the abortion debate, so I am very interested in how the theological rhetoric changed. I also realize that there is more dimensionality to the "evangelical" identifier than I am giving it in this post, but am unsure how to best address that, so hopefully you will understand the general question .

lazy_human5040