Republicans in South Carolina and Oklahoma are choosing their nominees in head-to-head runoffs, with the winners expected to be strong favorites in November. In South Carolina, interim Sen. Darline Graham faces Rep. Ralph Norman for the Republican Senate nomination after leading the 10-candidate primary with 32.7% to Norman’s 24.6%; President Donald Trump has endorsed Graham, while Kalshi prices her at 72% versus 28% for Norman despite a final Trafalgar Group poll showing a virtual tie at 47.9% to 47.8%. In Oklahoma, former state Sen. Mike Mazzei faces Attorney General Gentner Drummond after Drummond led the June primary by 0.28 percentage points, with both candidates receiving about 26%. Kalshi prices Mazzei at 80% versus 22% for Drummond, while a Sooner Survey cited by 270towin.com shows them tied at 44% among likely runoff voters, with 12% undecided and a 4-point margin of error. Trump has continued backing Mazzei, criticized Drummond as a "FAKE Republican," and the race is being watched after five of his gubernatorial picks in open primaries lost this cycle. Georgia Democrats are also contesting a special House runoff between Marcye Scott and Everton Blair Jr.