With the first presidential debate between White House hopefuls Hillary Clinton and Donald Trump set to air Sept. 26, we take a look back at some of the unforgettable moments in U.S. debate history. John F. Kennedy vs. Richard Nixon (1960)In the first televised presidential debate, Republican candidate Richard Nixon appeared less than camera ready next to Democratic opponent John F. Kennedy. When the question was posed during a presidential debate with Democrat opponent Walter Mondale, Reagan quipped, "I will not make age an issue of this campaign. When Quayle brought up the comparison during the debate, Bentson quipped, "I served with Jack Kennedy. George W. Bush vs. Al Gore (2000)During his run against George W. Bush, Al Gore sighed his way through most of the third presidential debate.

Source: CBC News September 24, 2016 15:22 UTC