Quote from Ricter:
The business background of our former presidents is well documented and, I would think, non-controversial. So it's the other major premise behind the assertion that would likely be challenged.
Except for JFK and "maybe" Clinton", the CP (career politician) category included more failures than successes, especially in the modern era. Seriously, you can't count either of the Bushes (being in a league of their own). He hasn't proved anything with the article, other than military service may be a plus, in some cases.