Maine's auditor is launching a progressive challenge to Rep. Jared Golden (D), a moderate who is seeking reelection in a critical battleground district.

Matthew Dunlap, the state auditor who formerly served as Maine’s secretary of state, announced on Monday that he plans to primary Golden, who was the only House Democrat to vote for the Republican stopgap bill ahead of the ongoing government shutdown.

Former Gov. Paul LePage is the leading contender for the Republican party's nomination, promising a tough fight for whoever emerges from the Democratic primary. A

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