To me that should be just about normal stuff. They have something that they're good at and they're probably a little smart but I would say MOST OF IT is luck, charisma, and other people holding them up and helping them.
Frankly, in both cases in all likely hood their underlings that work in the shadows producing what they do are quite smarter than them but you never hear about it. We've got the producers and speech writers and engineers and PR specialists that advise them on how to best approach the public.
There's shockingly little that these two actually do by themselves.