The Obama campaign's new ad mocking John McCain for not using email fails to recognize that because of the torture he endured as a prisoner of war, he is unable to use a typewriter keyboard. They are mocking a somewhat physically challenged man for his disability.
Jonah Goldberg, who found the Boston Globe noting in 2002 that "McCain's severe war injuries prevent him from combing his hair, typing on a keyboard", analogizes:
In a similar vein I guess it's an outrage that the blind governor of New York David Patterson doesn't know how to drive a car. After all, transportation issues are pretty important. How dare he serve as governor while being ignorant of what it's like to navigate New York's highways.