Democratic Gov. Janet Mills delivers her State of the State address at the State House in Augusta, Maine, on January 30, 2024. Robert F. Bukaty/AP/File

Maine Gov. Janet Mills is expected to announce her bid for US Senate on Tuesday, becoming the most high-profile Democrat to date to enter the race to challenge GOP Sen. Susan Collins, according to a source familiar with the plans.

The announcement date, the source cautioned, could shift due to the ongoing government shutdown.

Mills, a two-term governor and former attorney general, is a major recruit for Democrats looking for a seasoned opponent to take on the five-term incumbent. Senate Minority Leader Chuck Schumer spoke with her earlier this year about running.

But Mills is joining a crowded field of political novices , some of wh

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