Interim United States Senator Darline Graham captured [1] the Republican nomination for a full six year term Tuesday night, defeating Representative Ralph Norman in a closely watched South Carolina runoff.
The victory places Graham firmly on course to continue representing the deeply conservative state in Washington.
The contest followed the July 11 death of her brother, longtime Senator Lindsey Graham.
Governor Henry McMaster appointed Darline Graham on July 13 to serve the remainder of his term, which continues through early January 2027.
Graham entered the special election shortly after receiving the appointment and quickly secured the backing of President Donald Trump.
That endorsement gave her campaign immediate strength in a state where Republican voters remain solidly aligned with the president and his political movement.
The first round featured a crowded field of ten Republican candidates on August 11.
Graham finished first with approximately 33 percent of the vote, while Norman advanced with roughly 24 to 25 percent.
Representative Russell Fry placed third with about 20 percent, while former Governor Mark Sanford and several other candidates divided the remaining vote.
Because nobody won a majority, South Carolina law required Graham and Norman to face each other in a runoff.
Tuesday night returns showed Graham maintaining an advantage in the low to middle 50 percent range.
Norman remained in the middle to upper 40 percent range as outstanding precincts and later counted ballots continued breaking in Graham’s direction.
Decision Desk HQ called the race for Graham at 8:40 p.m. Eastern Time.
Decision Desk HQ projects Darline Graham wins the SC US Senate Republican Runoff#DecisionMade [2]: 8:38 PM EDT pic.twitter.com/7N8zAWwRKy [3]
— Decision Desk HQ (@DecisionDeskHQ) August 26, 2026 [4]
At that point, she led Norman by just under 14,000 votes, amounting to roughly five percentage points with 69 percent of ballots counted.
Norman needed a commanding performance in the Upstate and within the congressional district he already represents.
Instead, he fell short of the benchmarks suggested by his first round showing, leaving Graham with enough support elsewhere to build and preserve her statewide advantage.
The race had become noticeably tighter during the final days of campaigning.
Prediction markets including Kalshi and Polymarket initially placed Graham’s chances of victory between 70 and 80 percent or even higher, but those numbers narrowed as runoff day approached.
The changing odds reflected a competitive two person contest, though Graham retained the edge heading into Election Day.
Once actual voters replaced online speculation, the Trump endorsed senator proved capable of turning her institutional support into a clear victory where it mattered.
Trump had encouraged Graham to seek the full term and later joined her for campaign events in Myrtle Beach.
WATCH:
!function(r,u,m,b,l,e){r._Rumble=b,r[b]||(r[b]=function(){(r[b]._=r[b]._||[]).push(arguments);if(r[b]._.length==1){l=u.createElement(m),e=u.getElementsByTagName(m)[0],l.async=1,l.src="https://rumble.com/embedJS/u1vds3"+(arguments[1].video?'.'+arguments[1].video:'')+"/?url="+encodeURIComponent(location.href)+"&args="+encodeURIComponent(JSON.stringify([].slice.apply(arguments))),e.parentNode.insertBefore(l,e)}})}(window, document, "script", "Rumble");
Rumble("play", {"video":"v7chv68","div":"rumble_v7chv68"});
She also received support from McMaster, Senator Tim Scott, and several Republican officials, including Fry after his third place primary finish.
Norman assembled his own roster of prominent endorsements, including former Governors Nikki Haley and Mark Sanford.
Several members of the House Freedom Caucus also backed his campaign, citing his congressional record and established conservative positions.
Graham came into the race with limited elected experience but a record of public service and disability advocacy.
She previously served as commissioner of the South Carolina Commission for the Blind, an experience that became a significant part of her campaign biography.
Norman, a real estate developer and veteran congressman, first entered the House through a 2017 special election.
His runoff campaign emphasized his legislative history, conservative credentials, and years representing a portion of the state, but Republican voters chose Graham instead.
Graham will now face Democratic nominee Annie Andrews, a pediatrician who won her party’s primary in June.
South Carolina’s Republican leaning electorate and recent voting history make Graham the heavy favorite to secure the full term, leaving Democrats with a steep climb in November.