Maine Democratic Senate primary grows bitter as party vies to unseat Susan Collins

CBS News
March 17, 2026
3 min read

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A bitter Democratic primary in Maine features Gov. Janet Mills and oyster farmer Graham Platner competing to challenge Sen. Susan Collins.

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Gov. Janet Mills and Graham Platner are competing in Maine's Democratic Senate primary for the chance to challenge Republican Sen. Susan Collins. Mills brings decades of political experience, while Platner is an anti-establishment oyster farmer, creating a stark contrast in the race's character and messaging. Collins, a moderate Republican first elected in 1996, has become a target for Democrats despite holding one of the party's most competitive Senate seats. The winner of the primary will face an uphill battle in a state that has trended Democratic but where Collins has built a moderate political brand that appeals to independent voters. The competitive primary signals Democratic confidence in their ability to mount a serious challenge to the senator.

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