Now, this teacher is no genius. One of her other bumper stickers says, "I'm already against the next war". Good to know there's nothing she's willing to fight for--except the "right" to have bumper stickers on her car, I guess. But even idiots have free speech rights, and if there's nothing more to the story than what I've written above, she's right and the school is wrong.
Update, 3/13/11: This time it's a bus driver:
An Oregon school bus driver fired after he refused to remove a Confederate battle flag flying from his pickup truck has enlisted the help of a conservative civil liberties group in hopes of getting his job back.Hat tip to Colossus of Rhodey for the link.