South Carolina is holding its congressional primaries on June 9.
Nancy Mace defeated Kathy Landing in the Republican primary for South Carolina's first congressional...
An election worker sorts vote-by-mail ballots for the presidential primary in Washington on March 10. Jason Redmond/AFP via Getty Images hide caption
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Today, nine states and the District of Columbia are holding presidential, congressional, or other down-ballot primaries.
Indiana, DC, Maryland, Montana, New Mexico, Pennsylvania, Rhode...