Bumper stickers are seldom seen on Québec cars. It seems to have been more popular in the eighties/early nineties.

Generally, they are/were of the (light) humourous variety, i.e. "There's no such thing as gravity, the earth sucks" or, a bumper sticker reading, "My other car is a porsche" pasted on an an old, beat-up car.

I've never seen a political bumper sticker. I have seen a couple of fish stickers - the one that is a line-drawing of a fish, like a kiddy would make, that I'm told represents Jesus.