I did not see this myself but I have read some articles about this interesting interview/argument that went down between Ted Koppel and Jon Stewart. They get rather heated with each other and at the heart seems to be Koppel's unhappiness with Americans getting their news from a comedy show like The Daily Show.
Link
More complete transcript
I think Stewart is being a little naive if he doesn't realize that some people do in fact get their news from his show. Myself included - although I watch it first and foremost for the humor (which is the best on TV) but I fully admit that its one of the only ways I keep up to date with American politics. Is that wrong?
Anyhoo its an interesting debate between these two heavyweights.