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The Zogby poll is three weeks old. Useless.
Here's what the Gallup site says: "Barack Obama continues to hold a significant lead over John McCain, 49% to 42%, in the latest Gallup Poll Daily tracking results, which reflect the impact of the initial events of the Republican convention through early Wednesday, but not Sarah Palin’s highly-anticipated speech Wednesday evening." (emphasis mine). Or, significantly, McCain's rather blah speech tonight.
As I said, wait until tomorrow and, more reliably, after the weekend.