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A CEO who couldn't use email, handle a spreadsheet, or conduct an on-line meeting would be totally incompetent.
The fact that McCain can't do these things suggests that he sees the presidency as some kind of ceremonial meeting service. And the internet as some kind of nifty toy -- for those who like that sort of thing.
He is both too old and too out of touch with the real world to be entrusted with the Presidency.