Charles Rex Arbogast/AP
Democratic presidential hopefuls Sen. Barack Obama, D-Ill., left, laughs with Sen. Joseph Biden, D-Del., before the start of a presidential forum hosted by the AFL-CIO at Soldier Field in Chicago, in this Tuesday, Aug. 7, 2007, file photo. Sen. Joe Biden of Delaware is Barack Obama's pick as vice presidential running mate, The Associated Press has learned Saturday. Story here.

Question: How will Barack Obama's selection of U.S. Sen. Joe Biden help/hurt his presidential chances?

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