I remember when Al Gore was pro-life. So were other dems. Sam Nunn was pro-life and had a lot of conservative Christians on his staff. Then he announced he was pro-choice, although I do not remember the words he used. I was absolutely stunned. It seemed to me back then that decent dems with presidential aspirations felt that they had to turn their backs on life to move ahead. Nunn retired; Gore... I'm still not sure what he did.
If I had to vote for Sam Nunn of 1975 and Linc Chafee of 2005, I'd vote Democrat.