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Rasmussen Tracking Poll: Obama 48, McCain 47 (Yesterday: Obama 48, McCain 47)
Hotline: Obama 47, McCain 42 (Yesterday: Obama 45, McCain 44).
Daily Kos: Obama 49, McCain 43 (Yesterday: Obama 49, McCain 42).
Gallup: Obama 48, McCain 44 (Yesterday: Obama 49, McCain 45).
Four poll average: Obama 48, McCain 44 (Obama 47.75, McCain 44.5).
Here's the overall trend from Pollster.com (9/21)