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Rasmussen Tracking Poll: Obama 50, McCain 45 (Yesterday: Obama 50, McCain 45).
Hotline: Obama 48, McCain 41 (Yesterday: Obama 47, McCain 41).
Daily Kos: Obama 52, McCain 40 (Yesterday: Obama 51, McCain 41).
Gallup: Obama 51, McCain 41 (Yesterday: Obama 52, McCain 41).
Four poll average: Obama 50.25, McCain 41.75 (Obama 50, McCain 42).
Here's the overall national trend from Pollster.com in a cool new embeddable format.