Absolutely not.
Although there may be certain individuals that may be a notch above the others, the average intelligence of people that age is not enough to formulate a valid opinion of the candidates.
For example, a majority of the opinions 13 year olds would form would be things like, "Oh he has a really good speaking voice", "I really like how this guy looks, he has cool hair". Random nonsense along that line.
They will not be able to take in the actual arguments, in order to make an opinion based on the issues for the better good of the country.
So, my opinion is no.
Obama is proof that America's population is now, as a majority, low-class, ignorant, welfare-cheating slobs, who want nothing more than free food and shelter from a liberal government. Kids are far too stupid to vote IMO.