Sen. Tina Smith, who has represented Minnesota in the U.S. Senate since 2018, won’t try for another six-year term next year. An open seat could set off a scramble in both parties ahead of the midterm election.

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U.S. Sen. Tina Smith announced Thursday she will retire after next year, opting against a 2026 bid for another six-year term and putting a Democratic-held seat in play in an increasingly competitive Upper Midwest.