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.

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

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

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

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

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

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

The seat, held by Republican Sen. Susan Collins, could be one of only a few realistic Senate pickup opportunities for ...

In many ways, Janet Mills is the ideal Democratic recruit to take on Republican Sen. Susan Collins, a fifth-term moderate ...

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 ...