On March 6, 1892, Clements was appointed by President Harrison to the Interstate Commerce Commission, filling the unexpired term of Commissioner
Walter L. Bragg of Alabama, who had died. After being confirmed by the Senate, Clements was sworn in on March 17, 1892. On December 12, 1910, with the resignation of longtime Commission chair
Martin A. Knapp, he became acting chairman of the Committee, and in 1911 became chairman of the Commission for a one-year term. In addition to being appointed by President Harrison, he was reappointed by Presidents
Grover Cleveland,
William McKinley,
Theodore Roosevelt, and
Woodrow Wilson, and served as a commissioner until his death in
Washington, D.C., June 18, 1917. In 1916, Clements proposed that no worker be allowed to quit a railway company or urge others to do the same until the Commission had the opportunity to investigate the matter in a fair and equitable manner.
Locomotive Engineers Journal decried the proposal, especially as no provision was made for preventing the railroads from discharging workers at will. As a commissioner, he was considered to be a radical. Clements was among the commissioners who led the fight for the Commission to get real power over the railroads, a battle which nearly led to the Commission being legislated out of existence but which resulted in the passing of the
Hepburn Act in 1906. His predecessors had continued to serve as chair until they left the Commission; however, Clements chose to serve only the one-year term. He was interred in Cave Hill Cemetery,
Louisville, Kentucky. His twenty-five years on the Interstate Commerce Commission remained a record until surpassed by
Balthasar H. Meyer, who served 28 years from 1911 to 1939. It was said of Clements that no opinion written by him was overturned in substance by the
Supreme Court of the United States. He died on June 18, 1918, in
Washington, D.C. ==References==