Sen. Tom Carper Thomas (Tom) Richard CarperDemocrat asks for probe of EPA's use of politically appointed lawyers Overnight Energy: Study links coronavirus mortality to air pollution exposure | Low-income, minority households pay more for utilities: report OVERNIGHT ENERGY: Democrats push resolution to battle climate change, sluggish economy and racial injustice | Senators reach compromise on greenhouse gas amendment stalling energy bill | Trump courts Florida voters with offshore drilling moratorium MORE (D-Del.) coasted to a fourth term on Tuesday, beating back challenges from three other candidates who had sought to replace him.

Carper's most serious challenge came from Republican Rob Arlett, a Sussex County councilman who previously served as a state chairman for President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE's 2016 campaign.

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But Carper also faced two third-party challengers: Green Party candidate Demitri Theodoropoulos and Libertarian Nadine Frost.

Carper has been a perennial presence in Delaware politics for decades. He served as the state's treasurer, its lone representative in the House and its governor, before entering the Senate in 2001.

While Carper never appeared to be in jeopardy throughout his general election bid, he did fend off a progressive challenger in the Democratic primary. Former Democratic presidential nominee Hillary Clinton Hillary Diane Rodham ClintonButtigieg stands in as Pence for Harris's debate practice Senate GOP sees early Supreme Court vote as political booster shot Poll: 51 percent of voters want to abolish the electoral college MORE beat Trump in the state in 2016 by roughly 11 points and Delaware hasn't elected a Republican to the Senate since 1994.

The Cook Political Report rated the race as "solid" Democratic.