The popular two-term governor is 77. Her top challenger in the primary, oyster fisherman Graham Platner, is 41.

Democratic Gov. Janet Mills made her much-anticipated entry into the Maine Senate race, seeking to challenge Republican Sen.

A two-term Democratic governor, Ms. Mills called herself “battle tested” in an interview. But she faces a Democratic primary ...

Gov. Janet Mills, D-Me., kicked off her campaign for Senate Tuesday, joining a crowded primary field vying to challenge ...

Janet Mills has announced her candidacy for U.S. Senate, setting up a race that may serve as a proxy for the direction of the ...

Former "Meet the Press" moderator Chuck Todd says 'there's a real anti-incumbent and anti-establishment vibe inside the ...

Gov. Janet Mills's Senate candidacy boosts Democrats’ longtime hopes of picking off one of the GOP's most centrist senators, ...

Gov. Janet Mills ended months of speculation this week by officially entering the Democratic primary to challenge Republican ...

Maine Democratic Gov. Janet Mills announced that she will be running for U.S. Senate in an effort to unseat Republican Sen.

The 77-year-old's expected candidacy exposes a trend in this cycle of Senate Democrats’ reliance on older candidates to oust Republicans.

Mills, who is 77 years old, told NBC News she doesn't plan to serve more than one term and cast herself as the Democrat best ...

Maine Gov. Janet Mills is expected to launch a campaign for Senate on Tuesday, two Democratic sources told CBS News — vying ...