Arizona Sheriff Mark Lamb files paperwork to run for U.S. Senate

Pinal County Sheriff Mark Lamb has not officially announced his candidacy, but on April 10, he filed paperwork with the Federal Election Commission. Lamb is the first major Republican candidate to jump into the race, running for the seat against incumbent Independent Kyrsten Sinema. On the Democratic side, Congressman Ruben Gallego declared his candidacy back in January.

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