
Graham Platner (D) defeated David Costello (D) to win the Democratic primary for U.S. Senate in Maine on June 9. Platner will face incumbent Susan Collins (R) in the general election on Nov. 3. Ahead of the primary, the New York Times wrote, "To have any chance of retaking the Senate, Democrats must defeat Ms.…

Maine Gov. Janet Mills (D) announced on April 30 that she would suspend her campaign for the Democratic nomination for U.S. Senate, becoming the first governor to do so since 1988. In a statement, Mills said, “While I have the drive and passion, commitment and experience, and above all else — the fight — to…

Three candidates are running in the Democratic primary for U.S. Senate in Maine on June 9. As of April 2026, Janet T. Mills (D) and Graham Platner (D) lead in media attention, fundraising, polling, and endorsements. The winner of the primary will face incumbent Susan Collins (R) in the general election. According to the New…