Maine Poll Reveals Graham Platner Ahead While Collins Edges Janet Mills

A new poll suggests Susan Collins could face a competitive 2026 Senate race in Maine but the outcome may depend heavily on which Democrat becomes the nominee.

According to a survey released by Quantus Insights, Democrat Graham Platner leads Collins 48.6% to 41.8% in a hypothetical general election matchup among likely voters.

But the same poll shows a different result if Janet Mills enters the race.

In that scenario, Collins narrowly leads Mills 44.6% to 43.0%, placing the race within the survey’s ±3.5% margin of error.

The poll also tested the Democratic primary. Platner leads Mills 43.3% to 38.8%, suggesting a potentially competitive nomination battle.

The survey sampled 800 likely voters from March 3–5, 2026, according to Quantus Insights.

If the numbers hold, the data points to a volatile race where the Democratic nominee could dramatically reshape the general election dynamics.

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