Former North Carolina Sen. John Edwards acknowledged Thursday that amid his criticism of Wal-Mart Stores Inc., a volunteer member of his staff asked the world's largest retailer for help obtaining a hot new Sony Playstation 3 for Edwards' family. Edwards, a potential 2008 presidential candidate, told The Associated Press that the volunteer "feels terrible" about seeking the game unit at Wal-Mart while his boss claims the retailer doesn't treat its employees fairly. "My wife, Elizabeth, wanted to get a Playstation3 for my young children. She mentioned it in front of one of my staff people. That staff person mentioned it...