The United States presidential election of 1864 was the 20th quadrennial presidential election, held on Tuesday, November 8, 1864. Abraham Lincoln was re-elected as president. Since the election of 1860, the Electoral College had expanded with the admission of Kansas, West Virginia, and Nevada as free-soil states, but the electoral process was entirely disrupted by the American Civil War. No electoral votes were counted from all eleven Southern states, but elections were held in the Union-occupied states of Louisiana and Tennessee.
Lincoln ran as the Republican nominee against Democratic candidate George B. McClellan, who ran as the "peace candidate" without personally believing in his party's platform. A group of Republican dissidents nominated John C. Frémont, who later withdrew and endorsed Lincoln. In the Border States, War Democrats joined with Republicans as the National Union Party, with Lincoln at the head of the ticket.
On November 8, Lincoln won by more than 400,000 popular votes on the strength of the soldier vote and military successes such as the Battle of Atlanta. Lincoln was the first president to be re-elected since Andrew Jackson in 1832.