Gov. Janet Mills (D-ME) launched her campaign Tuesday for next year’s Maine Senate race, presenting what Democrats believe will be incumbent Sen. Susan Collins ‘s (R-ME) toughest opponent.

The term-limited Mills, who is serving her second consecutive term as governor, boosts Democrats’ longtime hopes of picking off one of the Senate’s most centrist Republicans in the battleground seat.

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“I’ve never backed down from a bully, and I never will,” Mills said in her launch video, which focused heavily on President Donald Trump. “Honestly, if

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