COLUMBIA — Voters will decide Tuesday who will replace the late U.S. Sen. Lindsey Graham on November ballots.

The special GOP primary runoff pits Graham’s younger sister, appointed U.S. Sen. Darline Graham, against U.S. Rep. Ralph Norman, who’s held elected office since 2004.

Darline Graham took first place in the 10-candidate primary two weeks ago, winning 33% of votes cast, while Norman followed with 25%, according to state Election Commission data.

But first place in a crowded primary doesn’t necessarily indicate who will ultimately win, as evidenced in June, when Lt. Gov. Pamela Evette’s narrow lead in the GOP gubernatorial primary turned into a historic walloping in the runoff won by Attorney General Alan Wilson.

Like Evette, Graham has the backing of President Donald Trump. But this time, the president didn’t dually endorse for the runoff, and he came to South Carolina to campaign with her.

Three days after traveling to Myrtle Beach and telling thousands of supporters to pretend it’s his name on the ballot, Trump quadrupled down on his endorsement in a call-in rally.

“She’s tough. She’s strong. And she’s the perfect person to carry on the legacy of her brother,” he told callers Monday night.

And he stressed, again, that she jumped into the race at his urging.

“I love her. I think she’s great. I asked her to do it. I got her into this whole thing,” he said. “I have to make sure she gets in because there will be nobody better.”

In a contest just 6½ weeks after Lindsey Graham’s unexpected death from a ruptured aorta — and just one month after his funeral — endorsements could matter more than normal. There hasn’t been much time for normal campaigning.

Graham’s other backers include Gov. Henry McMaster, who added his endorsement ahead of Trump’s visit; U.S. Sen. Tim Scott; and U.S. Rep. Russell Fry, who placed third in the Aug. 11 primary, all of whom were at Friday’s rally.

McMaster, who appointed her last month to fulfill her brother’s fourth term, again appeared with her Monday.

But Norman has his own long list of backers, including two former governors, Nikki Haley and Mark Sanford, who placed fourth two weeks ago; as well as U.S. Rep. Nancy Mace, and legislators with the hardline House Freedom Caucus that he helped launch.

Meanwhile, Norman is using Graham’s support as a plus for him, saying the D.C. establishment is going all out for her, which is why people should vote for him.

“All of DC has come against Ralph — that’s exactly why we need him,” Haley wrote on social media Monday night. “This job requires experience, and electing Ralph won’t just be good for South Carolina — it will be good for the health of our country.”

Norman, South Carolina’s 5th District congressman since 2017, points to his record to back up his conservative credentials, calling Graham untested and unknown. And critics have hammered Graham’s flub on a question about Taiwan during last week’s debate.

Graham, on the other hand, says her lack of political experience is a good thing. This is her first run for office.

“They say I’m not a politician. I say guilty as charged,” she repeated in Monday’s tele-rally.