The 1858 Delaware gubernatorial election was held on November 2, 1858. The Know Nothing incumbent governor of Delaware Peter F. Causey was ineligible to seek re-election. The Delaware Democratic Party nominated William Burton, the party's nominee in the 1854 election. The People's Party, formed from a coalition of the Know Nothings with the nascent Delaware Republican Party, nominated the former state treasurer James S. Buckmaster. Burton defeated Buckmaster in the general election by a narrow margin of 204 votes.
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