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Maine Democratic Senate Primary

February 22 – March 26, 2026

Where Things Stand

Governor Janet Mills and populist Graham Platner are competing in a June 9 primary to challenge Republican Senator Susan Collins for a seat that could decide control of the U.S. Senate. While Mills has the backing of Senate leadership, Platner holds a 55% to 28% lead in recent polls following endorsements from progressive Senators Elizabeth Warren and Bernie Sanders. The race has intensified as Mills runs attack ads regarding Platner's past social media comments while Platner secures high-dollar D.C. fundraisers.

Key Statements

WWashington Times

Emerson College poll shows Graham Platner leading Governor Janet Mills 55% to 28% in the Maine Democratic Senate primary

Provides the most recent polling data showing the significant lead held by the challenger.

TThe New York Times

Senator Elizabeth Warren endorsed Graham Platner... joining progressives in a challenge to the candidate favored by Senate Majority Leader Chuck Schumer.

Illustrates the national party divide between the progressive wing and the establishment leadership.

18 Articles

Platner holds comfortable lead over Janet Mills in Maine Senate race: Poll

washingtonexaminer.com logoWashington ExaminerCenter Right

Platner dominates Maine Democratic primary, leads Collins in potential general election: Poll

washingtontimes.com logoWashington TimesCenter Right

Democrats' chances of flipping Susan Collins' seat get major boost -- poll

newsweek.com logoNewsweekCenter

Hoping to unseat Collins, Maine Democrats battle it out in an expensive US Senate primary

npr.org logoNPRCenter Left

Scoop: Platner hits DC fundraiser, meets with House incumbents

axios.com logoAxiosCenter

Elizabeth Warren endorses Nazi-tattooed Graham Platner in high-stakes Maine Senate primary

foxnews.com logoFox NewsRight

Analysis generated by AI. Always verify with official sources.