The House Benghazi Committee's investigation will soon take center stage in American politics. Democratic presidential candidate Hillary Clinton will appear at a hearing held by the committee next month — little more than one year before the presidential election. Since its formation in 2014, the committee has served as something of a thorn in Clinton's side. The committee first uncovered that Clinton had used personal email and at least one private server as secretary of state. Her public responses to questions about her unusual email arrangement have dogged her presidential campaign, as new revelations have forced her to alter earlier...