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Jay Leno vs. Conan O'Brien
The beef: When Johnny Carson retired, the battle between Leno and "Late Show" host David Letterman to host "The Tonight Show" made big enough news that an HBO eventually made a movie about it. Years later, another "Late Show" host, Conan O'Brien, took over "The Tonight Show" only to have NBC give it back to Leno.
Who's in the lead: Leno has won, twice, but incurred the resentment of two funnier comedians -- and their fans.
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