Among Combs' other accomplishments as governor were requiring voting machines in state elections and passage of a law making the assessment of state employees for political campaign funds a felony.[36] At the end of his term, Combs backed Edward T. Breathitt to succeed him as governor.[2] Breathitt defeated Happy Chandler in the Democratic primary, then went on to defeat Republican Louie B. Nunn in the general election.[2] It was the only time in the 20th century that a Kentucky governor's preferred successor won election.[2]