COLUMBIA — U.S. Senator Darline Graham fielded questions from South Carolina journalists for the first time since her appointment to replace her late brother Lindsey Graham, holding a brief question-and-answer session with reporters Sunday as voters weigh whether to back her in a special Senate primary Aug. 11.Graham took ten minutes of questions in a 16-minute call with reporters Aug. 9, often repeating many of the responses offered in previous controlled settings and in stops on the state Republican party’s stump circuit, where she met with voters in Florence Aug. 8 after missing a previous stop in Charleston due to…