Senator Darline Graham, the sister of the late Senator Lindsey Graham, advanced to a Republican runoff Tuesday in South Carolina's special Senate primary, setting up an August 25 contest against Ralph Norman for the right to keep her brother's seat. Darline Graham Enters SenateDarline Graham is 62 years old and nine years younger than her brother, according to NBC News and Britannica. Their parents died in close succession when Lindsey Graham was 22, and he became her legal guardian, raising her as his own, according to Britannica and CBS News. Lindsey Graham, who was seeking a fifth Senate term and had already won a competitive primary in June, died suddenly on July 11. South Carolina GOP heads to RunoffThe August 25 runoff will determine the Republican nominee, who will be heavily favored in November given South Carolina's electoral history.