As jacalata pointed out, President Obama could be cited as a counter-example, and under the same criteria I would add at least Wilson to the list. Being percei

As jacalata pointed out, President Obama could be cited as a counter-example, and under the same criteria I would add at least Wilson to the list. Being perceived as an intellectual is not strictly exclusionary, but opponents will certainly try to hold it against a candidate - much like any other characteristic that can be played up for factionalism.