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Bitter Maine Democratic Senate Primary Pits Gov. Janet Mills Against Progressive Graham Platner

CBS reports that Maine’s Democratic Senate primary has turned sharply negative as 78‑year‑old centrist Gov. Janet Mills faces 41‑year‑old progressive challenger Graham Platner in a race to take on five‑term Republican Sen. Susan Collins, viewed as one of the GOP’s most vulnerable incumbents. Platner, an oyster farmer, military veteran and former private military contractor, has recently led in limited polling and outraised both Mills and Collins, bringing in about $7.8 million last year versus Mills’ $2.6 million and Collins’ $4.6 million. The contest escalated this week when Mills’ campaign launched a six‑figure statewide TV and digital ad buy highlighting crude and rape‑related comments Platner posted on Reddit in 2013, part of a broader controversy over past posts in which he allegedly called himself a communist, referred to police as "bastards," and disparaged rural white people, as well as a tattoo he later acknowledged resembled a Nazi symbol and says he has covered up. Platner has repeatedly apologized, blaming youthful "crude humor" tied to military culture and his post‑traumatic stress after Iraq and Afghanistan service, and said he is "f***ing embarrassed" by the remarks. With national Democrats, including Senate Minority Leader Chuck Schumer, having recruited Mills and outside groups expected to pour money into Maine, the primary is emerging as a high‑stakes generational and ideological fight whose outcome could shape Democrats’ odds of flipping the seat and the balance of power in the Senate.

2026 U.S. Senate Elections Maine Politics

📌 Key Facts

  • The Maine Democratic primary to challenge Sen. Susan Collins features Gov. Janet Mills vs. progressive Graham Platner, with a lesser‑known third candidate, David Costello.
  • Fundraising last year: Platner raised about $7.8 million, Mills $2.6 million, Collins $4.6 million, and Costello just over $21,000.
  • Mills’ campaign has launched a six‑figure statewide negative ad focusing on Platner’s 2013 Reddit comments about rape and women drinking, part of a broader outcry over his old posts and a tattoo he says resembled a Nazi symbol and has now covered.
  • Platner, an oyster farmer and former Marine and National Guard member, has apologized for the posts, attributing them partly to PTSD and what he calls crude military humor.
  • Mills, a former district attorney, attorney general and two‑term governor who won reelection in 2022 with 55% of the vote, was personally recruited by Senate Minority Leader Chuck Schumer and has campaigned as a proven statewide winner ready to take on Trump and Collins.

📊 Relevant Data

Maine's population is 92.2% White (non-Hispanic) as of 2022, with smaller percentages for other racial groups, and approximately 61.5% of the population lives in rural areas.

Maine population by year, county, race, & more — USAFacts

The median age of Maine's population is 44.8 years as of 2024, which is the highest in the United States.

2024 Population Estimates by Age, Sex, Race, and Ethnicity — Maine Department of Administrative and Financial Services

The median age of U.S. Senators at the start of the 119th Congress (2025) is 64.7 years.

Age and generation in 119th Congress: Younger, fewer Boomers, more Gen Xers — Pew Research Center

Recent polls indicate that Democratic challenger Graham Platner leads Republican Sen. Susan Collins by margins in hypothetical general election matchups, contributing to her status as a vulnerable incumbent.

Susan Collins Dealt Double Polling Blow in One Week — Newsweek

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March 17, 2026