I love this collection of newspaper cartoons from 1937, portraying Franklin Roosevelt's aggressive view of executive power. (via Instapundit.)
This web-resource would be SO much better if you could get a separate address for the cartoon. Unfortunately, the graphically uninteresting block of explanatory text comes along with the vivid image.
Let's Google for a more workable source of FDR cartoons. How about this? Here's a favorite (which I especially enjoy after spending the first week of classes teaching Marbury v. Madison in two different classes, to 1Ls and to 2- and 3Ls):