Violence has been caught on tape at the WI pro-union rally.
http://video.foxnews.com/v/4559550/reporter-mike-tobin-harassed-attacked/
In the video, the protestors attempt to shut down the reporter and his camera. They try shouting him down and then he reports that a guy hits him.
Take note of the sign behind the reporter when the violence erupts. It has a SEIU emblem on it. Remember them? They are the thugs that attacked the Tea Party people at the Townhalls.