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In March 2020, David Kim lost the Democratic primary for the U.S. House of Representatives in California's 21st district to incumbent Mark Takano. Kim had served as a state assemblyman from 2012 to 2016, and was the Democratic nominee in 2016 for the U.S. House seat that was then held by Darrell Issa. Takano was re-elected in the general election in November 2020.