Look for the McCain camp this week to start predicting that Obama will change his position on Iraq and to press the case that Obama has flip-flopped on a half dozen issues within the space of a month. (McCain, in his remarks yesterday, previewed this line of attack).

One McCain adviser says: "He is in a bad place. Caught between his promise to his base and the reality on the ground. Immediate withdrawal isn't a good place to be."

So far, there's no evidence -- aside from some vocal online critics -- that Obama's base is beginning get anxious -- he routinely gets support from more than 90% of liberal Democrats.

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