**Graham Platner secured the Democratic nomination for Maine’s U.S. Senate seat on June 9, 2026, with approximately 72% of the primary vote under ranked-choice voting.** This outcome aligns precisely with the market’s dominant 70-75% bucket. After Gov. Janet Mills suspended her campaign in late April, Platner faced only token opposition and consolidated support among Democratic primary voters. His profile as a Marine Corps and Army veteran, oyster farmer, and harbormaster helped build broad grassroots backing and endorsements despite earlier controversies over past online comments and personal matters. High turnout and limited remaining challengers produced a decisive margin exceeding 50 points, consistent with late polling showing him in the mid-to-high 70s among likely primary voters. The result matches historical patterns for consolidated Democratic primaries in the state once major rivals withdraw. Late-breaking developments that could still affect final certified tallies remain limited to standard canvassing adjustments or recounts in individual precincts, though none have been signaled as of mid-June.