His voice.Regardless of the reason his voice is unairable. When the average person turns him on its so distracting you have to turn it off; thus turning him off.
You can't win if you can't talk. Unless the company is prepared to swing so many votes to him electronically that he does win and I doubt that. No telling how well he will do.
The wild card is Cornel West who says he will run as a Third Party candidate. He scares the Dems.