Much has been discussed about John McCain not being able to use a computer and in an ad from the Barack Obama campaign (shown above) it says, "Can't send an email," referencing McCain. An article in Boston.com from 2000, shows McCain cannot type on a keyboard.
It took a blogger from The Corner less than a day to find an article in Boston.com that references John McCain injuries from Vietnam, showing he cannot tie his shoes, comb his hair properly or "typing on a keyboard," stating it was because of his severe war injuries, which limit his ability to do certain things with his hands.
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