Well, it shows that he does not understand the English language, and therefore deminishes his intelligence in the eyes of his people.
http://politicalhumor.about.com/library/blbushisms.htm
'Families is where our nation finds hope, where wings take dream.'
'I know how hard it is for you to put food on your family.'
'They misunderestimated me.'
'Rarely is the question asked: Is our children learning?'