Many Trump-endorsed candidates landing with a thud

On Tuesday night, Darline Graham, sister of the late Sen. Lindsey Graham, R-S.C., revealed somewhat awkwardly that she is entirely unprepared to be a U.S. senator. At a South Carolina debate, she was asked a perfectly reasonable and straightforward question: “Are Taiwan and the South China Sea national security issues for the United States?” And, “If so, why?” She sheepishly responded, “I’m just going to be honest here — I’m not on national security. I’m not that informed on national security,…