Polls: Platner Leads Collins in Maine Senate Race

In the race for Maine's U.S. Senate seat, Democratic challenger Graham Platner maintains a strong lead over incumbent Republican Senator Susan Collins and a commanding advantage in his party's primary against Governor Janet Mills, according to recent polls released this week. The developments, coming ahead of the June 9 Democratic primary, underscore a tightening contest in a state pivotal to Senate control.

A survey by the Maine People's Resource Center, conducted March 20-31 among 1,168 likely voters, showed Platner with 48 percent support against Collins' 39 percent in a general election matchup, with 12 percent undecided. The poll's margin of error was plus or minus 2.9 percentage points. It also indicated Platner leading Mills 61 percent to 28 percent in the primary, a 33-point margin that has widened since October 2025, when the same pollster found a near tie. Another survey by Emerson College Polling from March 21-23 among 1,075 likely voters placed Platner at 48 percent to Collins' 41 percent, while a hypothetical Mills-Collins race showed the two nearly even at 46 percent and 43 percent, respectively. RealClearPolling's average of general election polls gives Platner a...