The South Carolina Democratic Party held their primary for governor in the summer of 1934 and it attracted many politicians because of the change in 1926 to the South Carolina constitution providing for a four-year term. Johnston emerged victorious from the runoff against former Governor Cole Blease and effectively became the next governor of South Carolina because there was no opposition in the general election.
Jordan, Frank E. The Primary State: A History of the Democratic Party in South Carolina, 1876–1962. pp. 40–41.
"Supplemental Report of the Secretary of State to the General Assembly of South Carolina." Reports of State Officers Boards and Committees to the General Assembly of the State of South Carolina. Volume I. Columbia, South Carolina: 1935, p. 3.