Almost

Apparently key members of John McCain's staff were urging him to take a one-term pledge back in April of 2007 and the candidate was on board to the extent that such a pledge "was set to be the central thread of his presidential campaign, and Mark Salter, McCain's chief speechwriter, crafted an announcement speech around it." But at the last minute, McCain changed his mind. So I suppose this means that McCain's inner circle thinks he's not up for a second term?

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http://www.theatlantic.com/politics/archive/2008/06/almost/45185/