Michael Castle was elected governor of Delaware in 1984, defeating Democrat William T. Quillen with 55 percent of the vote. He easily won re-election in 1988, taking 70 percent of the vote against Democrat Jacob Kreshtool.
Castle was elected to the U.S. House in 1992 with 55 percent of the vote, defeating Democrat S.B. Woo. He was re-elected in 1994, defeating Democrat Carol Ann DeSantis with 71 percent of the vote.
In 1996, he was re-elected with 70 percent of the vote, defeating Democrat Dennis Williams. He defeated Williams in a rematch in 1998 with 66 percent of the vote.
Castle was re-elected with 68 percent of the vote in 2000, defeating Democrat Mike Miller. He beat Miller handily again in 2002, taking 72 percent of the vote.