Republicans Bruce Westerman and Tommy Moll face one another in the May primary.
The winner will face off against Democrat James Lee Witt and Libertarian Ken Hamilton in the November general election.
In the U.S. Senate race, four candidates will face off in the November general election.
Democratic incumbent Sen. Mark Pryor is facing off against Republican Congressman Tom Cotton Green Party candidate Mark Swaney and Libertarian Nathan LaFrance.
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