Ferguson>Letterman>Jimmy Kimmel>Falon>Leno>Conan

Conan just isn't funny.
Leno is a horrible interviewer.
Falon is nut job.

The rest of 'em I like. Craig Ferguson actually makes me laugh out loud pretty regularly.

The big question is why doesn't Dennis Miller have a show anymore. The answer is probably obvious in that 99% of the US population doesn't get his cerebral humor, but Miller is damn funny.

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