Three Republican lawmakers were confronted in a Madison, Wisconsin restaurant by a man who poured beer over them when a bartender stopped him from videotaping (via Wisconsin Reporter):

Madison Police responded to a disturbance at the Inn on the Park, 22 S. Carroll St., Wednesday night after a man dumped a beer over the head of a state lawmaker. The bartender said the man yelled out something like, “Money” and “Damn Republicans.” The beer was poured atop a 43-year old Burlington, WI man. It also splashed onto two other state lawmakers. All indicated the suspect swore at them, and called them criminals. He was accompanied by a man with a video camera. The bartender asked the videographer to turn it off. She says following the request, the suspect then took the glass of beer and emptied it onto the lawmaker’s head. The suspect then fled. The lawmaker, who took the direct hit, indicated the suspect has been harassing him since February, but up until this point, it had only been verbal. He did not know the suspect’s name, but a female State Capitol employee, who was with the group, was able to provide police with a name, and said Capitol Police would have his contact information. The MPD called Capitol Police and obtained a couple of possible addresses for the suspect, as well as a couple of possible phone numbers. Officers attempted to find the suspect, but could not locate him. He will likely face a tentative charge of disorderly conduct.

The perp was accompanied by videographer?  Sounds like it started as an ambush interview and escalated when the bartender intervened.

The perp has been identified by the MacIver Institute as Miles Kristan, who appeared in this video: