The 1984 Delaware gubernatorial election took place on November 6, 1984. Incumbent Republican governor Pierre S. duPont IV was barred from seeking a third term in office. Lieutenant Governor Mike Castle was elected to succeed him, defeating State Supreme Court Justice William T. Quillen.
This was the last time that a gubernatorial nominee and a lieutenant gubernatorial nominee of different political parties were elected simultaneously in Delaware.
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Text from the Wikipedia article “1984 Delaware gubernatorial election”, available under CC BY-SA 4.0.