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Two-term Democratic Gov. Janet Mills will challenge Republican Sen. Susan Collins, sources say, in a race Democrats view as crucial to regaining Senate control.

Mills, 77, was recruited by Senate leaders and will compete in the only 2026 Republican-held seat where Kamala Harris won the state.

Collins has held the seat since 1997, winning most reelections by double digits, though her 2020 victory margin narrowed to 8 points.

PORTLAND, Maine — Maine’s two-term Democratic Gov. Janet Mills will run for the U.S. Senate seat held by veteran Republican Sen. Susan Collins next year, two people familiar with Mills’ plans said Friday.

The development sets up a potential showdown between

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