The president’s pull with the party base has been clear and his resources are vast. But his low approval ratings make him a liability with swing voters.
President Trump campaigning with Representative Mike Lawler of New York in May. Republicans have to weigh Mr. Trump’s approval ratings against his popularity among his base.
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.
Runoffs in the state are typically sleepy, but the Republican Senate contest between Darline Graham and Ralph Norman seemed to be drawing relatively high turnout.
Republicans still have some clear advantages on the map, but President Trump’s unpopularity has opened the door for an outcome that once seemed far-fetched.