Barack Obama, Jimmy Fallon(01 of16)
Open Image ModalPresident Barack Obama sits with Jimmy Fallon during commercial break as he participates in a taping of the Jimmy Fallon Show, Tuesday, April 24, 2012, at the University of North Carolina at Chapel Hill, N.C.. (AP Photo/Carolyn Kaster) (credit:AP)
Barack Obama, Jimmy Fallon(02 of16)
Open Image ModalPictured: (l-r) Tariq 'Black Thought' Trotter, President Barack Obama, Jimmy Fallon -- (Photo by: Lloyd Bishop/NBC/NBCU Photo Bank via Getty Images) (credit:Getty Images)
Barack Obama, Jimmy Fallon(03 of16)
Open Image ModalLATE NIGHT WITH JIMMY FALLON -- Episode 622 -- Pictured: (l-r) President Barack Obama, Jimmy Fallon -- (Photo by: Lloyd Bishop/NBC/NBCU Photo Bank via Getty Images) (credit:Getty Images)
Barack Obama, Jay Leno(04 of16)
Open Image ModalPresident Barack Obama, right, talks with Jay Leno, right, during a commercial break during the taping of his appearance on NBCs The Tonight Show with Jay Leno, Wednesday, Oct. 24, 2012, in Burbank, Calif. (AP Photo/Pablo Martinez Monsivais) (credit:AP)
Barack Obama, Jay Leno(05 of16)
Open Image ModalPresident Barack Obama talks with Jay Leno, right, during a commercial break during the taping of his appearance on NBCs The Tonight Show with Jay Leno, Wednesday, Oct. 24, 2012, in Burbank, Calif. (AP Photo/Pablo Martinez Monsivais) (credit:AP)
Barack Obama(06 of16)
Open Image ModalPresident Barack Obama smiles towards the audience during his appearance for taping of NBCs The Tonight Show with Jay Leno, Wednesday, Oct. 24, 2012, in Burbank, Calif. (AP Photo/Pablo Martinez Monsivais) (credit:AP)
Barack Obama, Jay Leno(07 of16)
Open Image ModalU.S. President Barack Obama chats with host Jay Leno during a taping of “The Tonight Show with Jay Leno” October 24, 2012 at NBC Studios in Burbank, California. (MANDEL NGAN/AFP/Getty Images) (credit:Getty Images)
Barack Obama, Jay Leno(08 of16)
Open Image ModalU.S. President Barack Obama chats with Jay Leno during a break while recording an interview on the “Tonight Show with Jay Leno” at the NBC Studios in Burbank, California, on October 25, 2011. (JEWEL SAMAD/AFP/Getty Images) (credit:Getty Images)
Barack Obama, Jay Leno(09 of16)
Open Image ModalPictured: (l-r) President Barack Obama during an interview with host Jay Leno on March 19, 2009 -- Photo by: Paul Drinkwater/NBCU Photo Bank (credit:Getty Images)
Barack Obama, David Letterman(10 of16)
Open Image ModalPresident Barack Obama talks with David Letterman on the set of the "Late Show With David Letterman" at the Ed Sullivan Theater, Tuesday, Sept. 18, 2012, in New York. (AP Photo/Carolyn Kaster) (credit:AP)
Barack Obama, Jay Leno(11 of16)
Open Image ModalU.S. President Barack Obama (L) during an interview on the “Tonight Show with Jay Leno” at the NBC Studios in Burbank, California, on October 25, 2011. (JEWEL SAMAD/AFP/Getty Images) (credit:Getty Images)
Barack Obama(12 of16)
Open Image ModalU.S. President Barack Obama appears on 'The Tonight Show With Jay Leno' at NBC Studios on October 25, 2011 in Burbank, California. (Photo by Kevin Winter/NBCUniversal/Getty Images) (credit:Getty Images)
Barack Obama, Jay Leno(13 of16)
Open Image ModalU.S. President Barack Obama is seen with host Jay Leno during a taping of 'The Tonight Show' at NBC studios in Burbank, California. (MANDEL NGAN/AFP/Getty Images) (credit:Getty Images)
Barack Obama, David Letterman(14 of16)
Open Image ModalPresident Barack Obama sits with David Letterman on the set of the "Late Show With David Letterman" at the Ed Sullivan Theater, Tuesday, Sept. 18, 2012, in New York. (AP Photo/Carolyn Kaster) (credit:AP)
Barack Obama, David Letterman(15 of16)
Open Image ModalPresident Barack Obama sits with David Letterman on the set of the "Late Show With David Letterman" at the Ed Sullivan Theater, Tuesday, Sept. 18, 2012, in New York. (AP Photo/Carolyn Kaster) (credit:AP)
Barack Obama, David Letterman(16 of16)
Open Image ModalPresident Barack Obama talks with David Letterman on the set of the "Late Show With David Letterman" at the Ed Sullivan Theater, Tuesday, Sept. 18, 2012, in New York. (AP Photo/Carolyn Kaster) (credit:AP)