This Nov. 5, 2012 photo released by NBC shows Jay Leno, host of "The Tonight Show with Jay Leno," on the set in Burbank, Calif. During Leno’s two-decade tenure as NBC’s “Tonight” show host, the comic has cracked a total of 4,607 jokes at the expense of President Bill Clinton. The Washington-based Center for Media and Public Affairs counted and catalogued nearly 44,000 jokes Leno made about politics and public affairs during his time at “Tonight,” which ends Thursday.(AP Photo/NBC, Paul Drinkwater)
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