Oh, sort of like ad libbing an acceptance speech at the convention?
You seem overly impressed by multisyllabic terms not in common parlance. Others are less so, and deem such speech to be self important bloviation.
I'd tend to think that the success of Ronald Reagan, who was nothing if not folksy, but hailed as The Great Communicator precisely for his ability to speak to everyone, to bring clarity and simplicity to complexity, would be more of an ideal model for any Conservative, or even your garden variety, establishment Republican.
Wonky, complicated sentences are not the mark of any successful President in modern memory. GW Bush? Certainly not, although he had a much better grasp of the language than his occasional, tongue-tangled howlers might suggest. Clinton? Highly affected folksiness, very seldom veering into the sort of extemporaneity that you seem to think prerequisite. GHW Bush? Now, there's one who relished the occasional pompous turn of phrase. One termer. Reagan? Folksy as all get out. Carter? Wonk, wonk, wonk, and hated for it. One termer.
Are you beginning to sense a trend here?
President Dukakis sure wowed the people.