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Sizing Up Big Picture Polling, Battleground Wars

John McCain and Barack Obama are dashing across the country, making their final pleas in critical battleground states.

What states could still tip for Democrats or Republicans?

For analysis, Farai Chideya speaks with Mary Frances Berry — professor of history at the University of Pennsylvania — and Robert Traynham, D.C. Bureau Chief for the Comcast cable network, CN8.

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