This article has been corrected.
Republican Sen. Susan Collins remains the clear frontrunner in the race for Maine’s U.S. Senate seat, as she prepares to run for a historic sixth term. Known for her seniority, bipartisan appeal, and influence in key Senate decisions, Collins continues to command strong support within the state’s Republican base and among independent voters. Her long tenure and reputation as a pragmatic legislator have solidified her position as a formidable candidate heading into the 2026 election.
Democrats are also eyeing this seat, hoping to flip it in their favor. However, Collins has proven that she knows how to win tough races with the Senate majority potentially at stake.
Collins is a rare Republican voice in deep-blue Maine and has repeatedly outperformed GOP expectations in statewide races. Despite Maine being a reliably Democratic state, former President Joe Biden carried it by a wide margin in 2024; however, Collins has survived by building cross-party appeal. Unseating Collins has historically been a challenging task for many Democrats to accomplish. In 2020, Democratic nominee Sara Gideon raised $74 million and spent $62 million, only to lose to Collins by over eight points. Democrat Gov. Janet Mills, who is term-limited, is seen as Collins’ strongest challenger.
Collins raised $2.4 million between April and June of this year, closing the quarter with $5.3 million on hand as she seeks a sixth term.
Republicans currently hold a slim but decisive 53–47 majority in the Senate. Since senators serve six-year terms, about one-third of the chamber faces re-election every two years. For Democrats to flip control in 2026, they will need to hold onto every seat they currently have, which could be an uphill battle, especially in states such as Georgia and Michigan.
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