New York Gov. Mario Cuomo gives a thumbs-up gesture with both hands during his July 16, 1984, keynote address to the opening session of the Democratic National Convention in San Francisco. AP hide caption

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New York Gov. Mario Cuomo, appearing on a live call-in radio show in New York, Nov. 14, 1991, said he wouldn't be able to make a decision on his presidential candidacy until he had solved problems with the state budget. The standoff with the Legislature ultimately ran beyond the New Hampshire primary, preventing Cuomo from launching a bid. Ron Frehm/AP hide caption

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Koch served as mayor for three terms (1978-89). Ken Rudin collection hide caption

itoggle caption Ken Rudin collection

V ice President Joe Biden, left, and President Obama embrace following Biden's vice-presidential nomination acceptance speech at the Democratic National Convention in Denver, Wednesday, Aug. 27, 2008. Paul Sancya/AP hide caption

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