The 1864 Missouri gubernatorial election was held on November 8, 1864, and resulted in a victory for the Radical Republican nominee, Thomas Clement Fletcher, over Democratic nominee former Congressman (and former Lt. Gov.) Thomas Lawson Price. Conducted during the Civil War, all voters were required to take an oath of loyalty to the Union in order to cast their votes, greatly advantaging Fletcher. Simultaneously, the state called a constitutional convention to abolish slavery.
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Text from the Wikipedia article “1864 Missouri gubernatorial election”, available under CC BY-SA 4.0.