My guess is yes, Santorum is backing Rubio because he’s Catholic. Catholics are like that. (I know many!)
Orr could be Santorum is looking for a new job...no disrespect intended but what does he do when not writing a book or campaigning...
I'm a Catholic, and I'm for Trump. I know other Catholics here at FR who are for Trump. I was just trying to figure out Santorum's deal.