THE ANSWER is the 1976 Republican Nominating Convention at Miami, in which incumbent president Gerald Ford prevailed over maverick Ronald Reagan, but not before a spirited fight on the floor. Reagan stumbled when he oddly announced his tepid vice-presidential pick before the delegate vote (breaking with tradition). Some conservative delegates were distressed that his running mate choice was not "conservative enough." This misstep was enough to cost him the nomination. (Ford went on to lose to Jimmy Carter in the general election.)*
OH -- One quick correction, so that all elements of the answer may stand as correct: The site of the Convention was not Miami; but rather Kemper Arena, in Kansas City, Missouri. Thank you for your patience -- sedonadoc*
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