Hmmm - years ago, my daughter was expelled from school for drawing a picture of her teacher, cutting it out and taping it to the crucifix.

I also remember that when I was in high school, a Cuban immigrant (same age) was suspended for refusing to say the pledge of allegiance in her homeroom.

Last year a seven year old in my class, drew a cartoon that I will keep for ever. It was a picture of a child who had fallen asleep in his desk. He was sleeping soundly and drooling. The drool had made a pool on the desk and all the other children were pointing and laughing at him. Priceless! At the parent teacher conference, I showed it to his parents and told them he had a great future as a political cartoonist.   

I would have said the same thing to this boy's parents. If the drawing had depicted classmates, teachers, friends or family member, I would have been alarmed. Political cartoons are acceptable at the high school level. Critical expression should be encouraged.