Visible from all sides, as in Jerry's done an excellent job in this interview, really portraying the senator in the round. This expression, which dates from about 1800, was at first used for a free-standing piece of sculpture (as opposed to a relief on a wall), and a century later for a theatrical stage (called theater-in-the-round) so placed that the audience could see a performance from all sides. Since the 1920s it has also been used figuratively for someone or something seen three-dimensionally, as in the example.