John Yob, national political director for Rand Paul's presidential campaign, claims he was punched in the face last night by Rich Beeson, Marco Rubio's national campaign manager, and that Beeson is now on the run. 

Last night, Yob attended the GOP Mackinac Conference in Michigan, along with a number of other Republican campaign staffers, including Beeson. And the way Yob tells it, the tension you saw in the debate was nothing compared to what happened behind the scenes.
Sources: CBS