Hoping to unseat Collins, Maine Democrats battle it out in an expensive US Senate primary

Combat veteran and oyster farmer Graham Platner in Sullivan, Maine in 2025; Maine Gov. Janet Mills in National Harbor, Md. in 2023. Both Platner and Mills are Democrats vying to defeat Sen. Susan Collins, who is running for a sixth consecutive term in Maine.

As June's primary election nears, Democratic Gov. Janet Mills and combat veteran Graham Platner are effectively engaged in a proxy battle between factions in their own party.

(Image credit: Robert F. Bukaty/AP; Kevin Dietsch/Getty Images)