Funny you should mention that. There is a
story today about a cop that wrote a kid a ticket for wearing a NOBAMA shirt at a school function. The charges of "interference with staff of an educational facility," were dropped.
That charge does not sound like one a cop would act on his own if all the kid was doing was wearing a NOBAMA shirt and holding a McCain sign.
I think a school employee told the cop the sign was not allowed and that is what the cop acted on. (pure speculation on my part)
From the article.
Sounds exactly what you were talking about.