The Democrat has endorsed candidate Rudy Salas for the 2022 congressional race.
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The District 21 seat has flipped in the last two elections.
In 2018, Cox defeated Republican incumbent David Valadao.
Last year, Valadao beat Cox to regain the office.
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State Assemblyman Rudy Salas announced his run for Congress last month.
The Bakersfield native is one of almost a dozen candidates looking to challenge Valadao.