Sen. Darline Graham thanks Trump after winning GOP Senate primary runoff in S.C.

President Donald Trump has been campaigning for Darline Graham, a political novice and sister of late Senator Lindsey Graham, in a bid to secure her win in the South Carolina Senate Republican primary runoff. The election, which takes place on Tuesday, pits Graham against Ralph Norman, a member of the House Freedom Caucus who has benefited from his opponent's shaky performance in the only debate. Trump has been actively supporting Graham, holding a tele-rally with her and funneling nearly $830,000 into her campaign through the pro-Trump super PAC MAGA Inc.

The election is seen as a test of Trump's influence over Republican voters ahead of the midterm elections in 10 weeks. South Carolina has not elected a Democrat statewide in decades, making it a heavily Republican state. Graham's late brother, Lindsey, was a staunch supporter of Trump before his death last month.

Graham, who has no prior experience in politics, has been struggling to establish an independent profile in the state. Norman, on the other hand, has drawn on nearly two decades of state and federal political experience, presenting himself as a known quantity despite a recent third-place finish in the Republican gubernatorial primary.

The runoff campaign has been condensed to just two weeks following the unexpected death of Lindsey Graham in July. The winner will face Annie Andrews, a pediatrician and the Democratic candidate, in November's midterm election.