More intelligent by what measure? If you have a higher iq than me, it does not mean you'll come to a better conclusion or make a better decision. I am sure there are some areas you are more knowledgeable than I but other areas I will know more.
How is what you are proposing any different than slaves only being counted as 3/5ths of a person?
What would be nice is our representatives only being on committees where they could prove they were competant on the subject matter.