Here's a composite look at the six major tracking polls. (Both Gallup models report the same numbers today, so there's no need for two charts. Edit: This chart users Gallup expanded data for earlier days. If I'd used Gallup traditional data, the chart would look even better for Obama.)
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As you can see on the graphic on the home page, Obama's net lead has either stayed the same or grown in the last few days, depending on whether you're using the Gallup traditional or Gallup expanded numbers.
© Jed Lewison