Here is Ron Paul's position on abortion, he follows the US Constitution and doesn't vote on certain bills that would violate it.
http://www.ronpaul2012.com/the-issues/abortion/
Santorum is just another hypocrite politician who says one thing to Mother Angelica and RTL and Catholic Groups and does the opposite when he returns to congress. He tells them he's against the funding of planned parenthood and goes to congress approves the Title X appropriation that funds planned parenthood. We don't need people like him in the White House. He also was an absentee Senator only returning to Pennsylvania during the election cycle; that's one of the reasons why he wasn't reelected.
Ron Paul erroneously believes that states’ rights supersede the God-given inalienable rights of life and liberty. No way do we want him in the White House.
I’ll go with Santorum, who walks the walk in his personal life, and has been effective in politics.