"Milwaukee County Circuit Judge Mary Kuhnmuench found that there was no precedent for horn-honking being constitutionally protected political speech."

Azael Brodhead, a 36-year-old Iraq War veteran, represented himself, unsuccessfully, after he was ticketed for "Unnecessary Blowing of Horn":

Between 5:30 p.m. and 5:45 p.m. each day, someone in a black Honda would drive past Walker's house in Wauwatosa, blow his horn like crazy, give the finger through his sunroof and shout, "Recall Walker."

Week after week, the routine didn't change.

Then, on April 27, state troopers stationed at the Walker home decided to take action.

"I stopped the vehicle for the constant horn violation on today's date," wrote State Trooper Robert Simpson. "I asked the driver for his driver's license, and he immediately stated he was recording me and that he was a state probation agent." ...

"Probation agent is my day job," said Brodhead, who made $42,720 last year. "Being a concerned citizen is 24-7."

That happened in Wauwatosa, not Madison, it should be noted. I wonder what it would take for Madison police to ticket someone for political horn-honking.  Obviously, there have to be some generally applicable laws about excessive horn-honking. The question is whether they were selectively applied in this case.