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Democratic candidate for US Senate in Michigan Abdul El-Sayed addresses a rally at The Congregation in Detroit, Michigan on August 03, 2026. [AFP]

US Democrats vote Tuesday in their marquee primary in Michigan, choosing between a left-wing insurgent and an establishment-backed congresswoman in a contest that has become a proxy war over Israel, electability and the future of the national party.

The winner will face former Republican congressman Mike Rogers in November for the seat being vacated by retiring Democratic Senator Gary Peters, a race central to the party's difficult effort to win control of the Senate.

Democrats must defend Michigan while gaining four Republican-held seats to control the upper chamber, making the primary more than an ideological exercise in a state that has swung between the two parties in recent national elections.