The Library of Congress defines a political cartoon as a cartoon that presents a viewpoint on a contemporary political issue, situation, public figure, or institution. They frequently employ wit, satire, or caricature, and may use a vocabulary of symbols, types, or figures to represent political entities, bodies, or principles.
Most political cartoons are editorial cartoons about some recent current event, or trend in the world of politics. One pressing issue right now is the question of what to do in Kosovo. Feiffer's cartoon sums it up very well: new vietnam. An example of a non-pressing issue, but a reoccurring one is in Trudeau's cartoon on term limits. Both of these are about current events, but there is another kind of cartoon which just mocks politics in general. This is very common, and some examples of this are lies by Adams and crime pays by Wiley. Watterson has Calvin engaging in some polling, in a not so subtle way of telling his dad what he wants: polls, polls 2, and suicide.