After the war, Smith declined the offer of a colonelcy in the Regular Army.[3] He was mustered out of the volunteers on February 1, 1866.[6] He was subsequently engaged in Illinois politics, retiring from public life in 1872.[3] Smith was an Illinois delegate to the Republican National Convention. He moved to California in 1874 in a futile attempt to improve his health, but returned to Illinois two months before his death. He died at Bloomington, Illinois, and was buried in Bloomington Cemetery.[7]
^President Lincoln sent the nomination of Smith's appointment to the U.S. Senate on December 31, 1863 and the Senate confirmed the appointment on April 1, 1864. Eicher, 2001, p. 728.
^PresidentAndrew Johnson nominated Smith for the appointment on January 23, 1866 and the U.S. Senate confirmed the appointment on February 23, 1866. Eicher, 2001, p. 705.