How do you think he’s managed to govern Texas so well, if he can’t talk?
He hasn’t had a serious contender since gaining office. Debates? Few, far between with any of them. He’s got an “R” next to his name and that’s pretty much all it took to stay Governor.
He may be an average-decent speaker from prepared copy, et al, but he’s (clearly) not one to speak spontaneously in any clear or convincing manner. He stumbles, mumbles, and rambles too much. Sounds kinda like an idiot.
His debate performances are not the exception, they’re pretty much closer to the rule.