The 1866 Delaware gubernatorial election was held on November 6, 1866. On March 1, 1865, Republican Governor William Cannon died in office, elevating State Senate Speaker Gove Saulsbury, a Democrat, to the governorship. Saulsbury ran for re-election in 1866, the first Governor to do so since Joshua Clayton in 1792. He faced Republican nominee James Riddle, a prominent industrialist. Saulsbury defeated Riddle by a decisive margin, ushering in a large Democratic majority in both houses of the legislature.
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