Trump's Endorsement on Trial: Darline Graham vs. Ralph Norman in South Carolina Senate Runoff

South Carolina's Republican voters headed to the polls August 25 to decide whether Darline Graham — a political novice appointed to her late brother Lindsey Graham's Senate seat — can survive a primary runoff against Representative Ralph Norman, a seasoned hard-line conservative. The race is being watched as a direct referendum on Trump's endorsement power in 2026 midterm elections, with MAGA Inc. pouring more than $820,000 into Graham's campaign and Trump himself rallying in Myrtle Beach just days before the vote.

Darline Graham's path to the ballot was unusual by any measure. When Senator Lindsey Graham died suddenly in July, his campaign account held more than $2.3 million — funds that the campaign treasurer now controls and can redirect to political or charitable causes. Darline was then appointed to fill the seat, becoming the first sister in U.S. history to directly succeed a sibling in Congress. She entered the race as a complete political unknown, a liability Norman's supporters seized on repeatedly, with voters using the word 'nepotism' to describe her candidacy.

The regional geography of the race is critical. Norman drew strong support in Greenville County — the largest pool of Republican votes in the state — and in the conservative upstate regions. Graham dominated metro areas like Columbia and Charleston, and ran well in Midlands counties along the Georgia border. A late endorsement from Representative Russell Fry gave Graham a potential opening in Horry County, home to fast-growing Myrtle Beach, where analysts said she needed a commanding performance to improve her odds. Unusually strong turnout — already surpassing 280,000 ballots cast by 4 p.m. and potentially exceeding the roughly 336,000 who voted in the initial primary — complicated predictions, since runoffs typically draw lighter participation.

The race carries baggage beyond just Graham's inexperience. Trump's endorsement record in South Carolina has already taken a hit this cycle: his backed candidate, Lt. Gov. Pamela Evette, led the Republican gubernatorial primary by three points but lost the runoff to Alan Wilson after Trump made the unusual move of endorsing both finalists. Republican Party insiders in South Carolina privately expected Norman to win, framing a Graham victory — especially after she stumbled in a debate the previous week — as evidence of Trump's continued iron grip on the base. Meanwhile, Oklahoma held simultaneous Republican runoffs for governor and Senate, with the governor's race between Gentner Drummond and Mike Mazzei too close to call, partly divided over support for a proposed $4 billion aluminum smelter in Inola that Trump and Mazzei back and Drummond opposes.