Kim, a former national security adviser in the Obama administration, declared victory last week, but MacArthur did not concede while mail-in and provisional ballots still were being counted.
Kim’s win in the hotly contested race was an upset. He previously had not run for office. He’s the first Asian-American elected from New Jersey.
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MacArthur’s concession: In a Facebook posting, Rep. MacArthur wrote that he had called Kim to concede.