On the February 16, 2006 episode, Jon Stewart mocked the Republican Party's decision to edit scenes from A New Hope to make a promotional movie depicting themselves as fighting against "an evil Democrat Empire," to which Stewart replied, "You control the White House, both houses of Congress, the Supreme Court - you're not rag-tag rebels fighting against the Empire, you are the Empire!
As I recall, after this he said something to the effect of, "Besides, if the Republicans are the Empire, then the Democrats are, at best, Ewoks."