The National Archives has a nifty online exhibit of the work of political cartoonist Clifford K. Berryman.

From the Introduction to the exhibit:

Political cartoons are unlike any other form of political commentary. Visual in nature, cartoons show altered physical traits and highlight minute details to make a specific point. With simple pen strokes, they foreshadow the future, poke fun at the past, and imply hidden motives in ways that elude written or spoken reporting. The result of this creative license is a unique historical perspective—entertaining, clever, and insightful.

The site is called Running for Office. Berryman's cartoons ran on the front page of the Washington newspapers in the early part of the 20th century, but I was amazed to see how much they mirrored recent Presidential races. The cartoons are not only great artwork, they're great history. Check it out!