Sen. Darline Graham has advanced to a runoff in South Carolina’s special Republican primary to replace her late brother Lindsey Graham in the U.S. Senate. COLUMBIA, S.C. (AP) — Sen. Darline Graham has advanced to a runoff in South Carolina’s special Republican primary to replace her late brother Lindsey Graham in the U.S. Senate one month after his sudden death. Henry McMaster had appointed Darline Graham to serve the waning months of her late brother’s term. A super PAC that once supported Lindsey Graham has also spent hundreds of thousands of dollars backing Darline Graham. Voter George Mitford said Fry’s service stood out to him over Darline Graham, who hasn’t been in elected office.