Lindsey Graham's Senate seat is turning into a scramble, and President Trump's endorsement of the late senator's sister isn't clearing the field — meaning South Carolina voters will get a real fight instead of a dynastic coronation.

Why it matters: This is a safe Republican seat, which means whoever wins the Aug. 11 special primary will likely hold it for years. The question is whether that person answers to the people of South Carolina or to the same donor networks and lobby shops that kept Lindsey Graham in the Senate for over two decades.

Darline Graham Nordone, 62, was sworn in as interim senator last week after Gov. Henry McMaster appointed her following her brother's sudden death from heart complications on July 11. She announced Monday on Sean Hannity's Fox News show that she's running for the full term. "I've made a decision," she said. "I'm in."

Trump pushed for her appointment almost immediately after Lindsey Graham died, posting on Truth Social that McMaster should appoint her as "a fabulous tribute to Lindsey." Days later, Trump met with her in the Oval Office and gave her his "Complete and Total Endorsement," writing: "SHE WILL NEVER LET YOU DOWN. RUN, DARLINE, RUN!"

But the field isn't clearing. Rep. Russell Fry announced Monday he's entering the race, and a source in Fry's political orbit made clear this won't be a walkover: "This is really about giving voters a choice and not a coronation." Fry praised Lindsey Graham's legacy of "standing with President Trump" and said the best way to honor him is to "fight alongside the president just as steadfastly as he did." Rep. Ralph Norman and businessman Mark Lynch are also running, according to Fox News. The New York Post notes Rep. Nancy Mace had been exploring a run as well.

Nordone's resume raises fair questions. She spent nearly 30 years working in state government helping people with disabilities find employment, most recently as commissioner of a state agency for blind residents. The New York Times notes she "does not appear to have previous political experience, other than publicly supporting her brother's career." Senate Majority Leader John Thune called her a "strong candidate" but notably declined to endorse, saying only that she "has a right like anybody else to get into that race."

The filing window opens Tuesday and closes July 28 — the same day as Lindsey Graham's funeral, which was delayed so scores of world leaders and dignitaries could attend. That gives candidates roughly one week to formalize their bids.

What's not yet clear is who's bankrolling the challengers. Fry's camp touts that he's "accomplished more than all the potential candidates combined," having passed three bills in his first four years in Congress. But passing bills in this Congress isn't exactly a populist badge of honor. The donor networks that kept Lindsey Graham flush — the defense contractors, the immigration lobby, the foreign aid cheerleaders — are going to park their money somewhere. Whether that somewhere is Nordone, who carries the Graham name, or a challenger who talks Trump but votes swamp, is the multi-million-dollar question.

South Carolina Republicans have less than three weeks to sort it out.