The 1864 Connecticut gubernatorial election was held on April 4, 1864, and the first of two gubernatorial elections in which the Republicans adopted the National Union Party name, as the national party had done during the 1864 presidential election. Incumbent governor and National Union nominee William Alfred Buckingham defeated Democratic nominee Origen S. Seymour with 53.65% of the vote.
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Text from the Wikipedia article “1864 Connecticut gubernatorial election”, available under CC BY-SA 4.0.