I admit I haven't read all the entries here but I will say that I do like some political cartoons.
There were also some I didn't like because I think they went too far. I just wanted to ask, though they weren't exactly policital cartoons, if anyone remembered the Willy and Joe cartoons by Bill Mauldin. Mauldin worked for Stars & Stripes and one of the rumors was that General Patton didn't like him since he often didn't meet Patton's thoughts of proper military appearance. He also didn't usually treat officers very well in his cartoons. Here's just one of the websites where you can find out about him:
http://www.loc.gov/rr/print/swann/mauldin/mauldin-atwar.html. If you want to see some really good cartoons, look him up on the Internet. I think you'll learn quite a bit about cartooning and also about World War II.