What If Santorum Wins Michigan?

GOP strategist Matthew Dowd to George Stephanopoulos:

“If Rick Santorum wins tonight it’s the equivalent of a 9.0 on a Richter scale. I mean it is going to shake Washington, it’s going to shake Republican establishment it’s just going to shake things to their very core. And I think what you’re going to see are the conversations that have been going on behind quiet doors saying we need another candidate in this race.”