The special counsel’s lack of public commentary also hardly makes for good campaign material, said Larry Sabato, director of UVA’s Center for Politics. “Mueller is the great sphinx so far,” Sabato said. “No one really knows what he’s thinking or how far his investigation has come. It’s hard to grab onto fog.” Sabato noted that even he has lost track of the Mueller probe — a good example of why the topic isn’t front and center with candidates or midterm voters.