Clement Vallandigham was a prominent American politician and lawyer during the 19th century, known for his opposition to the American Civil War. He was a member of the Democratic Party and served as a U.S. Congressman from Ohio. Vallandigham was a vocal critic of President Abraham Lincoln's policies and advocated for peace negotiations with the Confederacy. In 1863, Vallandigham was arrested for expressing anti-war sentiments and was subsequently exiled to the South. He later returned to Ohio, where he continued to campaign for the Democratic Party and ran for governor. Vallandigham's legacy is often associated with civil liberties and the debate over free speech during wartime.