If Mitt Romney wins the Republican presidential nomination, he'll have many options for a running mate. His current rival, Rick Santorum, probably won't be one of them. Romney said as much Monday when Neil Cavuto asked him on Fox Business if he would choose a candidate to his right in order to win the election. "Well that would preclude, of course, Rick Santorum," Romney said. "Because, I mean, look at his record. I find it interesting that he continues to describe himself as the real conservative. This is the guy who voted against the right to work, this is the...