Dan Koh, who ran with the endorsement of former President Joseph R. Biden Jr., topped a crowded field to secure the nomination in the safely Democratic Sixth Congressional District.
After facing low approval ratings and endorsement setbacks, the president made a show of force in lifting Darline Graham to the Republican nomination for Senate in South Carolina.
Mike Mazzei, a former state senator who lent more than $11 million of his own money to his campaign, narrowly defeated the state’s attorney general, Gentner Drummond.
President Trump went all in for Senator Darline Graham in a primary runoff on Tuesday. It worked, preserving his undefeated streak in Republican Senate primaries this year.
Senator Darline Graham’s victory on Tuesday showed President Trump’s continued ability to move Republican primary voters, especially when he goes all in on a race.
Ms. Graham, who is temporarily filling the seat long held by her late brother, Senator Lindsey Graham, prevailed in a runoff and will be heavily favored in November.