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A president can arrange to get his information from underlings who want to please him. But such a president is susceptible to being steered by others who are fully aware of the extent of presidential knowledge --- and of any gaps in it. This is sometimes called living in a bubble.
But a president -- or senator -- who can occasionally use the internet for background information on vital policy matters can avoid this danger and have better control of subordinates. That is another reason why John McCain's lack of internet savvy is alarming. He can be kept in the dark.
