Evidently you are ignoring post 115. This was a Presidential race, not a Senate race.
Here is video of Senator Santorum on stage with Arlen Specter, as Specter is announcing his Presidential run, based on making the GOP a pro-abortion party, Rick Santorum endorsed him, and campaigned for him.
http://www.c-spanvideo.org/program/64281-1
Yes, I listed to it but he was still at the time an influential member of the Senate Judiciary Committee.
But here are Santorum’s ratings when he was in Congress.
American Conservative Union 88%
National Right to Life Committee 100%
Americans for Tax Reform 95%
National Tax Limitation Committee 92%
U.S. Chamber of Commerce 88%
League of Private Property Voters 94%
http://www.redstate.com/wosg/2012/01/06/rick-santorum-yes-he-is-a-true-conservative/