This is just a guess, but perhaps it's a fairly subtle way to create an equilibrium of sorts between the tolerance the press will have for "gaffes" that Sen. McCain makes and the tolerance the press ought to have for "gaffes" uttered by Sen. Obama. The press is vigilant about patroling McCain's every word for the slightest hint of a "senior moment." If Obama begins to be seen as a "gaffe machine," then McCain's flubs, by comparison, won't be overinterpreted. That's the theory, anyway. When the candidates meet for town hall meetings later the summer, both candidates have to filter themselves. When McCain is tired, he is prone to misremember and misstate his previous positions; when Obama is tired, he is prone to forget where he is.
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