Check out this frame, about 25 seconds in to McCain's "Accountable" ad.
Unless I'm mistaken, the woman McCain whose hand McCain shakes is wearing an Obama tee-shirt. I think the footage comes from McCain's appearance at the Lorraine Motel on the anniversary of MLK's death.
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Marc Ambinder is a contributing editor at The Atlantic. He is also a senior contributor at Defense One, a contributing editor at GQ, and a regular contributor at The Week.