Democrat Troy Jackson defeated Sen. Susan Collins in the Maine Senate race, ending the Republican’s five-term tenure in the Senate.
Ms. Collins, who has served since 1997, is the first Maine senator to lose a re-election bid since Democrat William Hathaway fell to Republican William Cohen in 1978.
Mr. Jackson, a former state Senate president, was a late replacement for Graham Platner, who withdrew as the Democratic nominee.
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He won by tapping into voter frustration with President Trump and the high cost of gas, groceries and health care.
That climate proved too much even for Ms. Collins, who has a history of defying electoral expectations and who has pointed to her record of steering federal money to Maine as chair of the Senate Appropriations Committee.
Mr. Jackson has vowed to end the Iran war, defund Immigration and Customs Enforcement, and fight for Medicare for All.

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