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  Castle: 50–60% 60–70% 70–80% Quillen: 50–60% 60–70% 80–90% | |||||||||||||||||
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| Elections in Delaware |
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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 governor and lieutenant governor respectively in Delaware.