Democratic leaders in Maine spent the weekend revising their 2026 Senate strategy after Graham Platner formally exited the race, according to state party figures involved in candidate recruitment. Platner told staff of his decision on Monday.

Platner, an oyster farmer and Marine Corps veteran who had built early grassroots momentum, removes one of the more prominent progressive challengers seeking to unseat Republican Senator Susan Collins, who is running for a sixth term.

The exit intensifies pressure on Democratic leaders to rally behind a single candidate. Maine Governor Janet Mills has been widely discussed as a potential contender, and national Democrats view the seat as central to any path toward a Senate majority. The Democratic Senatorial Campaign Committee has signaled it wants to avoid a divisive primary.

Republicans moved to capitalize on the disruption. The National Republican Senatorial Committee cited the reshuffling as evidence of Democratic disarray in a state Collins has repeatedly carried despite its Democratic tilt in presidential years. Collins has held the seat since 1997.

The race is expected to be among the most expensive and closely watched of the 2026 midterm cycle, with control of the Senate potentially hinging on the outcome in Maine and a handful of other competitive states.