When Senator Byrd resigned in 1965 he was replaced by his son Harry F. Byrd Jr. in the U.S. Senate. However, the heyday of the Byrd Organization was clearly in the past, ending 80 years of domination of Virginia politics by the Conservative Democrats with the election of a Republican governor, Linwood Holton, in 1969 for the first time in the 20th century, succeeding a longtime member of the Byrd Organization, Democrat Mills E. Godwin. To the amazement of many observers, Godwin changed parties and was elected again as governor in 1973, but as a Republican.