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DOVER, Del. (AP) -- Democratic Sen. Tom Carper of Delaware has won a fourth term in the U.S. Senate, defeating a GOP opponent who was President Donald Trump's state campaign chair.

Tuesday's victory over Republican Rob Arlett comes after the 71-year-old Carper trounced an antiestablishment progressive challenger in the Democratic primary.

Carper has never lost an election during four decades in politics. He touted his experience and ability to work with lawmakers from both parties during this year's campaign, despite being a vocal Trump critic.

FULL ELECTION RESULTS

Carper served five terms in the U.S. House and two terms as governor before being elected to the Senate in 2000.

During his tenure in the Senate, Carper has staked out a position as a centrist lawmaker with a strong interest in environmental issues.

(© Copyright 2018 CBS Broadcasting Inc. All Rights Reserved. The Associated Press contributed to this report.)