Sen. Darline Graham, the late Sen. Lindsey Graham’s sister who was appointed to fill his vacant seat, admitted during a South Carolina GOP Senate debate that she is "not that informed on national security" as she campaigns for a full six-year term.Graham made the candid admission just days before South Carolina’s GOP Senate runoff between her and Rep. Ralph Norman, R-S.C., after a moderator asked whether Taiwan and the South China Sea are national security issues for the United States. She responded that national security is "not my thing" and "not my area of expertise."The political newcomer...