He is a lot more glib than he wishes to appear.
He does have the Bush family 'English as a Second language' syndrome, but his use of 'nukular' for 'nuclear' and 'athalete' for 'athlete' are affectations he uses deliberately to help his detractors misunderestimate him.
So9
...affectations he uses deliberately to help his detractors misunderestimate him.
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Source?