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In page Republican National Convention:

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An exception was in 1976, when former California Governor Ronald Reagan nearly toppled incumbent President Gerald Ford at the convention in Kansas City. Gerald Ford was only in office for two years before he was challenged by Reagan, who was a fellow Republican. Reagan was on record saying that fellow republicans should never talk bad about one another, but Reagan's view had since changed, but the power of incumbency was too much for Reagan to overcome. This was the last GOP convention where the outcome of the nomination was in doubt. After the Republican National Convention, the pressure was on Ford to cut way the factionalism in his Republican Party.