Casey has a lifetime conservative rating from the ACU of 8%. Gillibrand isn't much better. They are both hardcore liberals.
Don’t trust the ACU. It’s head is a supporter of Romney and contributor to Arlen Specter.
http://www.freerepublic.com/focus/f-news/2289098/posts
But the question was about pro-life Democrats, not about how conservative they are. I know that Casey fits that bill.
And Gillebrand did some fancy flip-flopping after she was appointed. Notably on gun rights. Whatever her rating was, it should be much lower in reality.