Bumper sticker history lesson 1

A post from a few days ago reminded me of this:

Back in California's 1966 gubernatorial election, with incumbent Pat Brown running, a particularly rabid bumper sticker was seen in SoCal:

"IF IT'S BROWN, FLUSH IT."

I don't think this was the product of any candidate's committee; this had to have been a freelance job.

By the way, Pat Brown did indeed get flushed. He was beaten by a political unknown who had made his name as a movie actor. Some guy named Ronald Reagan.