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Story summary
- Sen. Martin Heinrich (D-N.M.) endorsed Graham Platner, a Maine Democratic Senate candidate, in Maine's Democratic primary for Senate, calling him essential to win back working-class voters.
- Platner is a Marine Corps veteran and oyster farmer who backs progressive economic policies and smaller military interventions.
- Platner's past offensive Reddit comments face scrutiny, attributed to PTSD.
- The primary is set for June 9, and Platner leads Mills in polls and Collins in hypothetical matchups.
