Gov. Janet Mills (D-ME) is widely expected to officially announce her candidacy Tuesday for the Maine Senate seat held by Sen. Susan Collins (R-ME), teeing up a perennial high-stakes battleground race against two longtime politicians with broad name recognition.

The likely campaign by Mills, 77, exposes a trend this cycle of Senate Democrats’ establishment wing relying on an older string of candidates to carry the party’s long-shot quest of retaking the upper chamber.

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Mills would be 79 if she takes office, making her the oldest freshman s

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