President Barack Obama and Jay Leno joke backstage before taping "The Tonight Show with Jay Leno" in Burbank, Calif., Oct. 25, 2011. (Official White House Photo by Pete Souza)

President Barack Obama and Jay Leno joke backstage before taping "The Tonight Show with Jay Leno" in Burbank, Calif., Oct. 25, 2011. (Official White House Photo by Pete Souza)