The South Carolina Democratic Party held their primary in the summer of 1915. Six candidates entered the race and among those who sought the seat was future Governor of South Carolina, Ibra Charles Blackwood. Samuel J. Nicholls emerged atop the first primary election on August 10 and won the runoff election against B.A. Morgan on August 24. There was no opposition to the Democratic candidate in the general election so Nicholls was elected to serve out the remainder of the term.
Jordan, Frank E. The Primary State: A History of the Democratic Party in South Carolina, 1876-1962. p. 110.
"Report of the Secretary of State to the General Assembly of South Carolina. Part II." Reports and Resolutions of the General Assembly of the State of South Carolina. Volume III. Columbia, SC: 1916.