Clement Laird Vallandigham ( /vəˈlændɪɡəm/; July 29, 1820 – June 17, 1871) was an American politician and leader of the Copperhead faction of anti-war Democrats during the American Civil War. He served two terms for Ohio's 3rd congressional district in the United States House of Representatives. In 1863, he was convicted at an Army court martial of opposing the war, and exiled to the Confederacy. He ran for governor of Ohio in 1863 from exile in Canada, but was defeated. Vallandigham died in 1871 in Lebanon, Ohio, after accidentally shooting himself in the abdomen with a pistol, while representing a defendant in a murder case for killing a man in a barroom brawl in Hamilton.