Seven states hold primaries Tuesday: California, Iowa, Mississippi, Montana, New Jersey, New Mexico and South Dakota.
In California, there are a number of competitive U.S. House races. Of note: In California, all candidates, regardless of party affiliation, are placed on the same primary ballot, and the top two advance to the general election in November.
Polls in California close at 8 p.m. local time, 11 p.m. ET.
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