I think McCain is right about Iraq - that the surge has been a success, and that eventual troop withdrawal should depend on that success continuing. But I think it is more important, for America and the world, that Obama should be the one who learns the truth of this the hard way.
In office, he would be forced to use his eloquence and his global popularity to make the case for what is left of the coalition to see its responsibilities to the Iraqis through. Many of his supporters, especially outside the US, would see it as a betrayal. I think it would be a necessary one, by which he could at last heal the suspicion of American power that provides so many around the world with easy excuses.
Oliver Kamm endorses Rentoul's conclusions here, as does Shabba Goy here. The latter also links to a fantastic piece by David Aaronovitch on Obama and anti-Americanism. It's not often I say this, but I agree with every single word in Aaronovitch's article and recommend you read the whole thing. I particularly liked this analysis of the roots of British and European anti-Americanism:
In part I think that anti-Americanism is linked to a view of change as decline. The imagination is that dynamic capitalism, associated with the US, is destroying our authentic lives, with our own partly willing connivance. It is a continuing and - at the moment - constant narrative, uniting left and right conservatives, which will usually take in the 19th-century radical journalist William Cobbett (conveniently shorn of his anti-Semitism) and end with an expression of disgust over the Dome, the Olympics or Tesco. Just as bird flu is a disease from out of the east, runaway modernity is a scourge originating to the West.
This is spot on. You can find this pessimism and disgust with western modernity reproduced in the Guardian comment pages every other day (from the assembled Buntings, Milnes, Steeles et al), and in the tired and facile anti-American 'humour' of every other BBC TV or radio comedy programme. And that sense of a loss of 'authenticity' neatly links the anti-Americanism of many on the left with their indulgence of religious fundamentalism - as long as it originates in the more 'authentic' East.