Governor Janet Mills withdraws from U.S. Senate race in Maine

What This is

• Maine Gov. Janet Mills suspended her campaign for the U.S. Senate, ending her challenge to unseat Republican Sen. Susan Collins.
• Mills said she lacked the financial resources to continue, after being consistently outraised by her Democratic primary opponent Graham Platner.
• Her exit leaves progressive newcomer Graham Platner, an oyster farmer aligned with Sen. Bernie Sanders, as the expected Democratic nominee.
• Mills withdrew about five weeks before Maine’s June 9 Democratic primary, shifting the race toward a Collins-versus-Platner general election matchup.
• Platner built momentum with large crowds and high-profile progressive endorsements, while drawing scrutiny over past inflammatory online posts and a controversial tattoo.
• Mills had been a top Democratic recruit backed by party leaders, and her withdrawal prompted Democrats to refocus on a contest seen as important for Senate control.
• Outside spending and advertising were already shaping the primary, including super PAC television buys and party-aligned ad reservations.

Why This Matters

• The episode shows how fundraising capacity and party Super PACs can rapidly determine which candidates remain viable, even when one starts with high office and party backing.
• Heavy outside spending raises questions about who sets a party’s agenda when super PACs and aligned groups can amplify or punish candidates at scale.
• A cleared primary can unify resources for the general election, but it can also lock in a nominee before doubts about controversies are fully resolved.
• The race highlights a broader tension between “experience and electability” arguments and grassroots demands for ideological change within a party.