“Even before Tuesday night’s debate, Sen. Darline Graham has been fending off questions about her qualifications to replace her brother, the late Lindsey Graham, in the Senate,” NBC News reports.“But her performance at the debate brought a fresh round of questioning in South Carolina — a state with a proud military tradition and several key bases and installations — when she whiffed on a question about Taiwan and acknowledged that she doesn’t know much about national security.”Washington Post: Darline Graham’s “oops” moment and the pitfalls of acknowledging ignorance.