When the Civil War began New York was the state with the largest population and the Union needed the strong support of New York if the Union was to win the Civil War. At the start of the Civil War the governor of New York was Edwin Morgan who was a Republican and a supporter of Abraham Lincoln. Morgan's support was a real plus for the Union War effort. This changed in 1863 when Horatio Seymour, who was a Democrat, was elected governor of New York. Although Seymour officially supported the Civil War he was often considered the most prominent Democratic opponent of President Lincoln. Seymour was also against the Emancipation Proclamation. So did Governor Seymour hurt the Union war effort? It can not really help the Union war effort to have an anti Lincoln politician as governor of the Union largest state.