The polls will be open from 7 a.m. to 8 p.m. LINK: Find your Delaware polling place
One of the big races is for U.S. Senate.
Senator Tom Carper, a moderate Democrat, is running for reelection. His primary opponent is Kerri Evelyn Harris, a community activist.
Republicans running include Gene Truono, Rob Arlett and Rocky De La Fuente.
There are also primaries for U.S. Representative, Attorney General, and State Treasurer.
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