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Arizona Sen. John McCain, left, the Republican presidential
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Arizona Sen. John McCain, left, the Republican presidential candidate, refers to the Democratic presidential candidate, Illinois senator Barack Obama as "that one" during the second presidential debate at Belmont University in Nashville, Tennessee. McCain's comment was viewed as disrespectful toward the first African-American presidential candidate nominated by a major party. Obama won the election. (Oct. 7, 2008)(Credit: AP)

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Key debate moments in history

Under the glaring lights of the national stage, presidential and vice-presidential candidates can make or break their campaigns. Here are some of the most notable.