Strictly speaking, some of the 'cartoons' linked here are really illustrations. The distinction? A cartoon is based on any item of news the cartoonist finds appropriate, and is his own take on that. An illustration has to accompany a specific article, and generally must follow the writer's conclusions.
I've decided that, for here, if it's vaguely political and appeared in a newspaper, it counts as a 'political cartoon' rather than 'editorial illustration'.
Click on one of the newspapers below to get to the pictures.