Jay Leno

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President Barack Obama, left, talks with Jay Leno during a commercial break during the taping of his appearance on “The Tonight Show with Jay Leno” in Los Angeles, Tuesday, Aug. 6, 2013. (AP Photo/Jacquelyn Martin)

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This July 10, 1995 photo released by NBC shows actor Hugh Grant, left, during an interview with host Jay Leno on "The Tonight Show with Jay Leno," in Burbank, Calif., two weeks after Grant's highly publicized arrest for picking up a prostitute. After 22 years, Leno will host his last show on Thursday, Feb. 6, 2014. (AP Photo/NBC, Margaret Norton)

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This Oct. 12, 2012 photo released by NBC shows President Barack Obama during an interview with host Jay Leno on NBC's "The Tonight Show with Jay Leno," in Burbank, Calif. After 22 years, Leno will host his last show on Thursday, Feb. 6, 2014. (AP Photo/NBC, Paul Drinkwater)

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This April 26, 1995 photo released by NBC shows host Jay Leno embracing bandleader Kevin Eubanks on "The Tonight Show with Jay Leno," in Burbank, Calif. After 22 years, Leno will host his last show on Thursday, Feb. 6, 2014. (AP Photo/NBC, Margaret Norton)

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Republican presidential candidate Texas Gov. George W. Bush talks with Jay Leno during an appearance on "The Tonight Show with Jay Leno" in Burbank, Calif., Monday, March 6, 2000. (AP Photo/Eric Draper)

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Jay Leno gestures during the opening monologue at the inauguration of "The Tonight Show with Jay Leno" which was broadcast live on the east coast from NBC Studios in Burbank, Calif., May 25, 1992. The show features a new band with jazz musician Branford Marsalis as musical director. Leno's first guests were comedian Billy Crystal and singer Shanice. (AP Photo/Craig Fujii)

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Up next? Jay Leno has cracked nearly 44,000 jokes about politics and public affairs as host of the "Tonight" show, mainly at the expense of Democrats. Some speculate that the comic will put his own hand in politics. (NBC via Associated Press)

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This Oct. 12, 2012 photo released by NBC shows President Barack Obama during an interview with host Jay Leno on "The Tonight Show with Jay Leno," in Burbank, Calif. After 22 years, Leno will host his last show on Thursday, Feb. 6, 2014. (AP Photo/NBC, Paul Drinkwater)

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Former President Bill Clinton was the butt of 4,607 jokes from late-night host Jay Leno between 1992 and 2014, according to a new study. (ASSOCIATED PRESS)

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FILE - In this Monday, Dec. 9, 2013, file photo, former President Bill Clinton speaks at a CGI Clinton Global Initiative Latin America event at the Copacabana Palace in Rio de Janeiro. During Jay 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 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/Silvia Izquierdo, File)

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This Oct. 12, 2012 photo released by NBC shows President Barack Obama during an interview with host Jay Leno on "The Tonight Show with Jay Leno," in Burbank, Calif. After 22 years, Leno will host his last show on Thursday, Feb. 6, 2014. (AP Photo/NBC, Paul Drinkwater)

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This July 10, 1995 photo released by NBC shows actor Hugh Grant, left, during an interview with host Jay Leno on "The Tonight Show with Jay Leno," in Burbank, Calif., two weeks after Grant's highly publicized arrest for picking up a prostitute. After 22 years, Leno will host his last show on Thursday, Feb. 6, 2014. (AP Photo/NBC, Margaret Norton)

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This Jan. 30, 2014, photo provided by NBC shows Miley Cyrus, left, during an interview with host Jay Leno, on "The Tonight Show with Jay Leno." Leno, who took over the "Tonight Show" in 1992, will host his final episode on Thursday, Feb. 6, 2014. (AP Photo/NBC, Paul Drinkwater)