FILE - In this Thursday, May 14, 2009 file photo, about 100 demonstrators march down a highway as union organizers, clergy, students and others demonstrate at a Wal-Mart distribution center in Fontana, Calif. For years, the world's largest retailer has tried to repair a reputation that's been damaged by decades of criticism and legal troubles. In April 2012, allegations that Wal-Mart paid bribes to officials in Mexico threaten to derail Wal-Mart's attempts to improve its image. (AP Photo/Reed Saxon)

Associated Press
FILE - In this Thursday, May 14, 2009 file photo, about 100 demonstrators march down a highway as union organizers, clergy, students and others demonstrate at a Wal-Mart distribution center in Fontana, Calif. For years, the world's largest retailer has tried to repair a reputation that's been damaged by decades of criticism and legal troubles. In April 2012, allegations that Wal-Mart paid bribes to officials in Mexico threaten to derail Wal-Mart's attempts to improve its image. (AP Photo/Reed Saxon)
FILE - In this Thursday, May 14, 2009 file photo, about 100 demonstrators march down a highway as union organizers, clergy, students and others demonstrate at a Wal-Mart distribution center in Fontana, Calif. For years, the world's largest retailer has tried to repair a reputation that's been damaged by decades of criticism and legal troubles. In April 2012, allegations that Wal-Mart paid bribes to officials in Mexico threaten to derail Wal-Mart's attempts to improve its image. (AP Photo/Reed Saxon)
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