He's either a sufferer of social anxiety or a bad actor. Either way, not a good politician...
That appearance on Olbermann was pretty good though...Did anyone hear the person in the background yelling talking points?
YES! At one point, it clearly sounds like someone is telling him to say something. During the break later on, Olbermann said Greene's lawyer was just out of camera range, possibly feeding him answers.
If that was his lawyer, it would be especially odd. I don't think a public defender would be available for their client's media appearances.