Robert F. Kennedy Jr.'s recent speech at a memorial event drew attention not only for its content, including a comparison of Charlie Kirk to Jesus Christ, but also for the noticeable quiver in his voice. This is due to spasmodic dysphonia, a neurological disorder he developed in his early 40s.Robert F. Kennedy Jr.'s recent speech at a memorial event drew attention not only for its content, including a comparison of Charlie Kirk to Jesus Christ, but also for the noticeable quiver in his voice. This is due to spasmodic dysphonia, a neurological disorder he developed in his early 40s.