I think it sort of depends on the person but I mostly agree. There is massive power in someone who truly believes "anything is possible" and takes massive action on extremely high goals they set for themselves and achieve. The Napoleon-Hill-Approved humans who let nothing get in the way of their self-designed "definite life purpose". Better examples of celebs-turned-political are Ronald Reagan and Arnold Schwarzenegger, who put the effort into learning the material and acknowledging the crowd.

Although Trump and Oprah are undoubtedly the kinds of action-takers who make their extremely high goals a reality, in my opinion they both lack one or two other vital presidential qualities that come with their personality types. Trump lacks the humility to admit what he doesn't know and learn it— instead he lashes out on Twitter, taking every unimportant comment personally; he is always thinking about competition and personal problems rather than considering all-inclusive encouragement. Oprah has the opposite problem; I can't judge her until she's given a chance, but I imagine her relying too much on people-pleasing, and would perhaps struggle to deal with constant decisions millions of people will dislike her for no matter what she chooses (unless she can afford a few hundred million "free cars" to give away to her new audience).