Delaware's senior senator is seeking a fourth term.
Sen. Tom Carper, a Democrat, recently announced he's running for re-election.
Carper is a former Naval aviator and governor who was first elected to the U.S. Senate in 2000.
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He said in an interview on MSNBC on Monday that he was considering retirement before last year's presidential election because he thought Hillary Clinton would win and Democrats would hold a majority in the Senate. But with President Donald Trump's victory, Carper said he's more motivated than ever to serve in the upper chamber.