Obama maintains polling lead over McCain

A new Gallup poll suggests Barack Obama's lead over John McCain is virtually unchanged since the GOP convention began.

The poll is based on interviews conducted Monday through yesterday. It shows the Democrat leading among respondents 49 to 42%. All but a few of the interviews were conducted before Sarah Palin gave her speech last night.

Obama led by 6%age points in a Gallup survey conducted last weekend, prior to the start of the Republican gathering.

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