The 1863 California gubernatorial election was held on September 2, 1863, to elect the governor of California. Former governor John G. Downey was unsuccessful in his bid for reelection to a second, non-consecutive term, losing to former United States Representative Frederick Low. This was the state's first gubernatorial election for a four-year term; previous governors had only served two-year terms.
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Text from the Wikipedia article “1863 California gubernatorial election”, available under CC BY-SA 4.0.