Larry Sabato’s Crystal Ball : “Gov. Janet Mills (D) entered the Maine Senate race on Tuesday morning, giving Sen. Susan Collins (R-ME) a more proven potential challenger even as other Democrats are seeking the nomination.”

“We are moving the Maine Senate race from Leans Republican to Toss-up, which means we now have four Senate Toss-ups: Republican-held Maine and North Carolina and Democratic-held Georgia and Michigan.”

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