Update: Guy who wrestled MoveOn activist to ground (not head-stomper guy) apparently ID'd as Mike Pezzano. Pezzano has a page at a Paul meetup site describing an interest in new meetup groups for Democratic Undeground, various pro-Marijuana groups, and an anti-Bush group:
More here: http://theothermccain.com/2010/10/26/man-in-kentucky-head-stomping-incident-identified-as-mike-pezzano/