Thomas J was also known as a "stammerer". I wouldn't think it too sensible to judge anyone's intelligence by how they speak publicly, especially a President of the United States, who no doubt has more on his mind than a single issue.
Well, if 5-6 years of hearing our dry-drunk's half-spastic attempts to express a coherent thought aren't a clue, perhaps you should also listen to What he says when he manages to say something.
Phrases like "religion of peace", "I'm now signing the CFR bill", "Harriet Miers is the most qualified..." come to mind.
Or just tune in to what this bizarre little Saudi-Prince-kisser is about to do this month...namely murder the United States to make room for his sick dream of "Amerexico".