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UNH Poll: Platner Leads Mills by 38 Points in Maine Senate Primary

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  Published in Politics and Government on Tuesday, February 24th 2026 at 21:04 GMT by WGME
      Locales: Maine, UNITED STATES

MANCHESTER, N.H. - February 25th, 2026 - A new University of New Hampshire (UNH) poll released today reveals a stunning lead for former State Party Chair Betsy Platner over incumbent Governor Janet Mills in the Democratic primary for Maine's open Senate seat. Platner commands a commanding 38-point advantage, securing 46% of support from registered Democrats, while Mills lags behind at a mere 8%. The remaining 46% of respondents remain undecided, indicating a significant portion of the electorate is still open to persuasion.

The survey, conducted between February 21st and 23rd with a sample size of 520 registered Maine voters, carries a margin of error of +/- 4.4%, making Platner's lead statistically significant. This poll marks a dramatic departure from earlier expectations, where Governor Mills was widely considered the presumptive frontrunner due to her name recognition and two terms as Governor.

From Governor to Underdog: What's Behind the Shift?

Political analysts are scrambling to understand the reasons behind the sudden shift in momentum. Several factors appear to be at play. While Mills enjoys a strong overall approval rating - the UNH poll showed 68% of Maine Democrats approving of President Biden, suggesting a generally favorable Democratic environment - her moderate stance on key issues is increasingly at odds with the progressive base of the party. Platner, in contrast, has campaigned aggressively on a platform that embraces progressive ideals, particularly regarding reproductive rights and climate change.

Indeed, the poll demonstrates strong support among Democrats for policies Platner champions. A striking 69% of Maine Democrats support codifying Roe v. Wade into state law, a position Platner has loudly and consistently advocated. Similarly, 68% view climate change as a serious threat, aligning with Platner's commitment to ambitious environmental legislation. While Mills has supported environmental initiatives, critics argue they haven't gone far enough or lacked the urgency demanded by many Democratic voters.

"This isn't simply about policy preferences," explains Dr. Amelia Stone, a political science professor at Bowdoin College. "It's about a perceived authenticity. Platner is seen as genuinely committed to the progressive cause, while Mills is viewed by some as a pragmatist who prioritizes electability over principle. In a primary, the base often rewards ideological purity."

The Role of National Trends and Fundraising

National trends are also contributing to the dynamic. The increasing nationalization of Senate races means that Democratic voters are more attentive to issues and candidates aligned with the national progressive movement. Furthermore, Platner has significantly outpaced Mills in fundraising, particularly from small-dollar donors. This financial advantage allows her to saturate the airwaves with campaign ads and mobilize grassroots volunteers.

Mills' campaign has attempted to paint Platner as an inexperienced outsider, emphasizing the Governor's proven track record of leadership. However, this messaging appears to be falling flat, with many voters expressing a desire for fresh perspectives in Washington. Mills' team is reportedly considering a shift in strategy, attempting to highlight her accomplishments on issues like healthcare access and economic development. However, the timeline is shrinking, and the poll numbers suggest time is not on her side.

Undecided Voters: The Key to Victory

The large bloc of undecided voters - 46% - remains the crucial battleground. Both campaigns are targeting these voters with tailored messaging. Platner aims to solidify their support by framing the race as a choice between bold progressive change and incrementalism, while Mills is attempting to portray herself as a steady hand in turbulent times.

The next few weeks will be critical. Another UNH poll scheduled for mid-March is expected to provide a clearer picture of the race and whether Mills can mount a comeback. However, as of today, the momentum is undeniably with Betsy Platner, and the Maine Democratic Senate primary is shaping up to be a significant upset in the making. The full results of the UNH Survey Center poll are available [ here ].