Really?  Dubya?  Have a gander at this link and tell me again how high is IQ is.  They even coined a word for his malapropisms, Bushisms.

http://www.snopes.com/politics/bush/piehigher.asp

Nobody with above average intelligence could be that bad at expressing himself in his mother tongue.

The Donald is probably fairly bright, although he has disturbing narcissistic traits and is a petulant bully.