The 1966 United States Senate election in Kentucky took place on November 8, 1966. Incumbent Republican Senator John Sherman Cooper was elected to a second consecutive term in office, defeating Democrat John Y. Brown Sr. in a rematch of the 1946 special election. This would be the first statewide election in Kentucky in which a Republican won Elliott County, and the only one until 2016 when Donald Trump won the county for president.
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Text from the Wikipedia article “1966 United States Senate election in Kentucky”, available under CC BY-SA 4.0.