The 1864 Maryland gubernatorial election took place on November 8, 1864. Incumbent Union Party Governor Augustus Bradford did not run for re-election. Union Party candidate Thomas Swann defeated Democratic candidate Ezekiel F. Chambers.
The Union Party was a Southern Unionist political movement which supported the Lincoln administration. Most Unionists were former Whigs who had joined the Know Nothing movement in the 1850s, while a minority were Radical Republicans or War Democrats. The party supported the re-election of Abraham Lincoln under the banner of the National Union Party.
Swann took his oath of office on January 11, 1865, but by a provision of the 1864 State Constitution, he did not actually become Governor until January 10, 1866.
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Text from the Wikipedia article “1864 Maryland gubernatorial election”, available under CC BY-SA 4.0.