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Voters in Alabama, California, Iowa, Mississippi, Montana, New Jersey, New Mexico and South Dakota headed to the polls Tuesday, the biggest flurry of activity yet in an already contentious primary season.
Lauren Arthur is the 42nd Democrat this cycle to win a red seat in a special election.
On Tuesday night, as major primaries all across the nation were decided, yet another special election was held, this time for a vacant GOP-held seat in Missouri.
Updated on June 6 at 10:10 a.m.