Then-Sen. Hillary Rodham Clinton huddles with Jay Leno during an appearance in 2008. (Charles Dharapak / Associated Press)
Presidential candidate Sen. John McCain talks with host David Letterman on the set of “The Late Show with David Letterman” in 2008. (J.P. Filo / Associated Press)
When running for president in 1992, Bill Clinton donned shades and played the sax on “The Arsenio Hall Show.” (Reed Saxon / Associated Press)
Texas Gov. George W. Bush enjoys a talk with Jay Leno in March of 2000. (Mark Boster / Los Angeles Times)
