I recall President Reagan being heckled and he handled himself very well. I also remember Slick being heckled and he handled it well. Barry the Kenyan just doesn’t have it and he sure as heck isn’t a ‘brilliant speaker’.
One cannot be hopelessly tacky, completely undiplomatic, require a teleprompter to put to words together and still be a “brilliant speaker”. He might be a good reader, but not a “brilliant speaker”.