Dan Kleban, a co-founder of the Maine Beer Company, announced Wednesday that he was running for Senate in Maine, joining an expanding Democratic primary field that may not be settled for months.

National party leaders are anxiously waiting to hear whether Gov. Janet Mills, a two-term Democrat, will join the list of those vying to unseat Sen. Susan Collins, the lone remaining Senate Republican in New England.

Mills, 77, said recently that while she was “seriously considering” a run against Collins, she was unlikely to make any announcement until mid-November. “I’m not in any rush to make a decision,” she told reporters.

But Kleban, 48, is not waiting for Mills to decide, hoping his personal story — a college dropout from a middle-class family who went on to found a successful brewery

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