Pendulum Swinging Back

Ambinder: The average of the 4 tracking polls today is an exact tie -- 46-46. McCain bounce ends and race reverts to where it was before the conventions. Since state polls tend to be lagging indications -- and they're much more dated -- we'll see those numbers settling back in the next week. SurveyUSA is already showing that Obama has pulled ahead in Virginia, a six-point shift in just one week....