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Former Delaware governor and congressman Mike Castle has died. He was 86.

Castle was among Delaware's most successful politicians, never losing a race until his stunning upset in a 2010 U.S. Senate primary.

During his 18 years in Congress, he became a leader of centrist Republicans, earning a reputation as a fiscal conservative and social moderate not afraid to challenge the party line.

His signature issue in Congress was creating the popular 50 State Quarters Program, which featured commemorative coins honoring each state, starting with Delaware.

Former Delaware Gov. Mike Castle, a Republican moderate who championed creating the popular 50 State Quarters Program of commemorative coins while he served in Congress, has died. He was 86.

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