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Rasmussen Tracking Poll: Obama 51, McCain 45 (Yesterday: Obama 50, McCain 45).
Hotline: Obama 47, McCain 41 (Yesterday: Obama 47, McCain 42).
Daily Kos: Obama 51, McCain 41 (Yesterday: Obama 51, McCain 42).
Gallup: Obama 49, McCain 43 (Yesterday: Obama 50, McCain 42).
Four poll average: Obama 49.5, McCain 42.5 (Obama 49.5, McCain 42.75).
Here's the overall national trend from Pollster.com in a cool new embeddable format.