The Associated Press projects that Trygve Hammer will win the Democratic congressional primary in North Dakota's single congressional district.
Hammer, a former teacher and military veteran, was running against Roland Riemers for the Democratic nomination in the race to succeed three-term Republican Rep. Kelly Armstrong.
With Republican Gov. Doug Burgum not seeking re-election to a third term as governor, Armstrong ran for the GOP gubernatorial nomination instead of bidding for re-election to Congress.
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Burgum, who unsuccessfully ran for the 2024 Republican presidential nomination before dropping out late last year and weeks later endorsing former President Trump, is considered a leading contender to serve as Trump's running mate.
No Democrat has won a congressional election in red-state North Dakota since 2008.
Republicans control the House with a 218-213 majority, and four seats (three controlled by the GOP and one by the Democrats) are vacant.