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Here’s who’s vying to replace Graham Platner as Maine Democratic Senate nominee

Published July 10, 2026 · Updated July 10, 2026 · By Elizabeth Lopez

Maine Democrats Vying to Replace Platner in Senate Race

Here s who s vying to replace - Here's who's vying to replace Graham Platner as Maine's Democratic Senate nominee. The party is now in a critical race to choose a successor after Platner suspended his campaign following sexual assault allegations. With his official withdrawal, Democrats have until July 27 at 5 p.m. to finalize a replacement, a process set to unfold at an upcoming convention. The outcome of this selection will determine the state’s next Democratic Senate candidate and shape the battle against Republican Senator Susan Collins in the November election.

Shenna Bellows: A Key Player in State Politics

Shenna Bellows, Maine’s Secretary of State, is among the top contenders. A Hancock native, she previously ran for governor but narrowly missed victory in last month’s primary. Bellows has a longstanding presence in state politics, having served in the Maine Senate and as executive director of the American Civil Liberties Union of Maine. She also holds the distinction of being the first woman to lead the state’s secretary of state office. With her extensive experience, she is viewed as a strong candidate to challenge Collins in the general election.

"I’ve fought for working people across my career, and I’m not done yet," Bellows said in a recent social media post, emphasizing her commitment to progressive policies.

Bellows’ 2014 Senate race against Collins was a significant campaign, though she lost by 37 percentage points. During her gubernatorial run, she focused on affordable housing and proposed a property tax freeze, funded by doubling rates on non-resident homes. Her campaign raised nearly $1.8 million, reflecting broad support. Despite her political accomplishments, Bellows faces the challenge of overcoming her previous loss to Collins, a seasoned senator with a strong track record.

David Costello: A Veteran of Maine Politics

David Costello, a Bangor native, is another prominent candidate. He previously ran against Platner for the Senate nomination and expressed readiness to re-enter the race if Platner stepped down. "I’m back in," Costello said, signaling his intent to contest the nomination again. His 8.1% vote share in the recent primary underscores his role as a persistent challenger, though he trails significantly behind Platner (72.1%) and Governor Janet Mills (19.2%).

Costello has been involved in Maine politics for years, serving in both state and federal roles. His campaign for Senate nomination raised over $30,000, with personal financial contributions exceeding $100,000. While he initially supported Platner, he has since positioned himself as an independent voice within the Democratic Party. His alliance with independent Senator Angus King, who caucuses with Democrats, adds an interesting dynamic to his candidacy.

Valli Geiger: A Loyal Ally with Ambiguous Plans

Valli Geiger, a state representative and longtime associate of Platner, has also emerged as a potential nominee. The 70-year-old, from Rockland, has served in the state legislature for three terms. She initially hinted at replacing Platner, stating that Platner supported her bid. However, she later clarified that she is one of "several people" backing the effort, leaving room for speculation about her role in the race.

"Platner was supporting my bid," Geiger told WMTW, though she emphasized her position as one of many allies in the Democratic Party's quest for a new nominee.

Geiger’s experience in state government positions her as a reliable candidate, but her political strategy remains unclear. Her campaign highlights include advocacy for local issues and a focus on community-driven policies. While she has strong ties to Platner, her ability to attract broader support will be crucial in securing the nomination.

Troy Jackson: A Progressive with Political Experience

Troy Jackson, former state Senate president, has entered the race as a third contender. A fifth-generation logger from Allagash, he filed an exploratory committee with the Federal Election Commission, signaling his intent to run. Jackson claimed he is "the best person" to succeed Platner, highlighting his progressive credentials and experience in public service.

With over two decades of involvement in Maine politics, Jackson has held positions in both the House and Senate. Initially targeting the governor’s office, he finished third in the Democratic primary after raising around $1 million. His support from Platner and independent Senator Bernie Sanders of Vermont suggests a strong network of allies. However, Jackson must now prove his viability as a candidate in a competitive race against Collins.

Key Considerations for the Democratic Nomination

The Democratic Party’s internal dynamics and external pressures will play a critical role in selecting the next Senate nominee. Candidates are vying to demonstrate their ability to unite the party and appeal to a broad electorate. Shenna Bellows’ track record, David Costello’s grassroots appeal, Valli Geiger’s loyalty, and Troy Jackson’s progressive vision all present distinct advantages and challenges.

Here's who's vying to replace Platner, but the process also hinges on the party’s ability to address key issues such as voter turnout, policy priorities, and the legacy of previous campaigns. As the July 27 deadline approaches, the focus will shift to strategic fundraising, messaging, and the alignment of each candidate with the party’s broader goals. The winner will face a formidable task in challenging Susan Collins, a Republican senator with strong national and state-level support.

With the race heating up, Maine Democrats are preparing for a high-stakes selection. The nominee’s ability to connect with voters, articulate a compelling platform, and navigate the state’s complex political landscape will be essential. As Here's who's vying to replace Platner, the Democratic Party’s choice will set the stage for a pivotal election that could reshape the Senate’s balance of power.