The 1976 Delaware gubernatorial election was held on November 2, 1976. Pitting incumbent Democratic Governor Sherman W. Tribbitt Against U.S. Representative Pete du Pont. Largely due to the state's unresolved financial problems, du Pont defeated Governor Tribbitt by a landslide margin of 57% to 42%. This is the last time that an incumbent governor of Delaware lost re-election.
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Text from the Wikipedia article “1976 Delaware gubernatorial election”, available under CC BY-SA 4.0.