In 1966, Hathaway was elected governor of Wyoming, a Republican-leaning year. He defeated the Democrat Ernest Wilkerson, 54.3 to 45.7 percent, an attorney from Casper who proposed a state severance tax.<ref>Taxing Wyoming Minerals: Severance Taxes and Permanent Funds | WyoHistory.org, accessed July 22, 2021.</ref> | In 1966, Hathaway was elected governor of Wyoming, a Republican-leaning year. He defeated the Democrat Ernest Wilkerson, 54.3 to 45.7 percent, an attorney from Casper who proposed a state severance tax.<ref>Taxing Wyoming Minerals: Severance Taxes and Permanent Funds | WyoHistory.org, accessed July 22, 2021.</ref> |