Horatio Seymour (May 31, 1810 - February 12, 1886) was an American politician. He was Governor of New York State in 1853-4 and 1863-4. Seymour was a so-called War Democrat who supported the Union's military cause; however, during his second term as governor, he became a leading Northern opponent of President Abraham Lincoln's administration during the American Civil War. Seymour protested Lincoln's restriction of civil liberties during the Civil War, as well as the Emancipation Proclamation and the Union's military draft. He advocated the vigorous prosecution of the war, but protested against the extensive use of war powers by Lincoln.