So it is now acceptable for non-law enforcement personnel/political flunkies to manhandle another citizen who asks questions the flunkies find unacceptable?
With any luck, this guy will press charges and one of his law professors will assist the young man in suing the person's involved, the Senator himself, and the police department for not arresting these men on the spot.
If Joe citizen had walked up and started man-handling these same individuals, Johnny Law would have had their tasers out or called in the SWAT team and Joe citizen would be sitting in jail right now.