The announcement on Monday that Representative Ruben Gallego, a progressive Democrat from Phoenix, would run for the Senate in 2024 sets up a potential face-off with Senator Kyrsten Sinema over a seat that carries immense stakes for Democrats’ control of the upper chamber.
Ms. Sinema left the Democratic Party in December to become an independent, though she has kept her Democratic committee assignments. She has not yet announced re-election plans, but if she runs again, national Democrats will have to decide whether or not to support her, even as the state party has strongly rebuked her and some polling has shown her to be deeply unpopular among Arizona Democrats, signs of a possibly divisive battle to come.
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