John Osborne and James W. Gerencser, eds., “Marcus Junius Parrott,” Dickinson Chronicles, http://chronicles.dickinson.edu/encyclo/p/ed_parrottMJ.htm.
After law school, Parrott moved back to Dayton and practiced law for several years before serving as a Democrat in the Ohio Legislature from 1853 to 1854. Parrott's interest in the free-state and abolitionist cause prompted him to move to Leavenworth, Kansas in 1855, where he became a Kansas Supreme Court reporter and a representative to the Topeka Consitutional Convention that October. By this time an enthusiastic member of the Free-State Party and optimistic for the realization of a slave-free Kansas, Parrott served as a delegate to Congress for the Kansas Territory from 1857-1861. He was in Washington when Kansas was finally granted statehood in January 1861 as a free state and it was he who telegraphed the news to waiting Kansans. Parrott ran as one of the new U.S. Senators for the state but achieved only a narrow third. He failed similarly to win a House of Representatives seat as an Independent in 1862 and as a Democrat in 1874.
In the late 1860's Parrott retired to a farm outside Leavenworth with his wife and three children. His failing health prompted him to make a trip back to Ohio in 1877 to visit his relatives. After suffering from several strokes and paralysis, Parrott died there on October 4, 1879 at the age of fifty. He was buried in the Woodlawn Cemetery in Dayton.