HUNTINGTON, W.Va. — He stands behind her, guarded and on the lookout. His head is turning left, then right, then left again, the way one watches a tennis match. Philippe Reines could be mistaken for a Secret Service agent for Chelsea Clinton, the former first daughter who is anxious to regain that title. Now, as a crowd surrounds the youngest Clinton at a Marshall University campaign stop, Reines is on the lookout for hangers-on, swooning frat boys and, mostly, looming trouble in the form of microphones, cameras and notepads. When sharp-elbowed television reporters manage to slip through the crowd and...