To those who felt that the Reconstruction was unduly harsh, his prescience was hailed—he became known as the "Old Roman," a Texas Cincinnatus. He was part of the successful effort to remove Republican Edmund J. Davis from the governorship in 1874, after Davis attempted to illegally remain in office after he had lost the election. That year Reagan returned to the Congressional seat he held before the war, serving from March 4, 1875, to March 3, 1887. In 1875, he served in the convention that wrote a new state constitution for Texas. In Congress, he advocated federal regulation of railroads and helped create the Interstate Commerce Commission. He also served as the first chairman of the Committee on Post Offices and Post Roads. Though he had been elected to the Senate in 1887 (serving March 4, 1887 to June 10, 1891), he resigned to become chairman of the Railroad Commission of Texas at the behest of his friend, Governor James Stephen "Jim" Hogg, who had run on a platform of state regulation of railroads, and chaired it until 1903.