You sound exactly like those who were sure that Ronald Reagan could not only ever be elected, but if he did it'd be a catastrophe of epic proportions. And these were Republicans saying this.
America is not interested in any Elvis qualities. America wants, and positively responds to, the truth.
Ronald Reagan had more 'Elvis', more 'Star Quality' than any Republican since Teddy Roosevelt. I supported him strongly.
No president has been elected since the invention of TV who didn't have Charisma, Star Quality, Elvis, call it what you will. Most Americans, not party activists, but average voters, never encounter the truth and wouldn't know it if it bit them. What you say sounds good, but it's Civics Book Fantasy, not reality.
SO9
Richard Nixon? Jimmy Carter? "Charisma" isn't the word that comes to my mind, but maybe charisma is in the eye of the beholder.