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Maine Gov. Mills will announce challenge to Sen. Collins in key 2026 Senate contest, AP sources say

Janet Mills, urged by Democratic leaders, aims to unseat Susan Collins in a key battleground where Democrats need four seats to retake Senate majority, officials say.

  • Janet Mills, Maine's two-term Democratic governor, will run for the U.S. Senate seat held by Republican Susan Collins in the 2026 election, according to sources on Friday.
  • Mills' decision follows encouragement from national Democratic leaders, who saw her as the top candidate to unseat Collins and gain a critical seat for their uphill quest for a Senate majority.
  • Mills, who began her trailblazing legal career in Maine in the 1970s and later served as attorney general, joins several Democrats already campaigning, including oyster farmer Graham Platner.
  • Senator Bernie Sanders publicly supported Platner as “a great working class candidate…who will defeat Susan Collins” and criticized party leaders for pushing Mills to run.
  • The race in Maine draws attention as it is the only 2026 Senate contest where a Republican incumbent defends a seat in a state won last year by Democratic nominee Kamala Harris.
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Maine Gov. Mills will announce challenge to Sen. Collins in key 2026 Senate contest, AP sources say

Maine’s two-term Democratic Gov. Janet Mills will run for the U.S. Senate seat held by veteran Republican Sen. Susan Collins next year.

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WGME broke the news in on Friday, October 10, 2025.
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