Will Graham Platner be the Dem nominee to face Susan Collins in Maine’s '26 Senate race? Primary is on 6/9.
95% of users predicted YES — the community got this one right. 39 predictions cast.
Graham Platner won Maine's Democratic U.S. Senate primary on June 9, 2026, capturing 77.7 percent of the vote and securing the party's nomination to challenge five-term Republican Sen. Susan Collins in November. Platner's closest competitor was Gov. Janet Mills, who remained on the ballot despite suspending her campaign in April after falling short on fundraising, and finished with 16.7 percent. Former government official David Costello drew the remaining 5.6 percent. Platner, a political newcomer, entered the race early in 2025 and built substantial small-dollar fundraising momentum, drawing national Democratic attention to a race viewed as one of the more competitive Senate contests of the 2026 cycle. The primary was conducted against a backdrop of controversies, including scrutiny of past social media posts and a tattoo, but none prevented Platner from consolidating Democratic support following Mills' withdrawal. The 95 percent of Predict Six participants who predicted his nomination correctly assessed the race's trajectory after Mills stepped aside.