Show me the source in this article for Santorum's quote. No mention of who he said this to, such as an editorial board.
Why don’t you ask Santorum himself?
When Karen announced to Dr. Allen, the abortionist doctor with whom she lived for seven years 1982-1989, that she met a new guy Rick Santorum, and she was moving out, she told him that Rick was “pro-choice”:
Dr Allen told the Philadelphia City paper in 2005: ‘When she moved out to go be with Rick, she told me I’d like him, that he was pro-choice and a humanist.’