Wal-Mart is taking a page from the modern political playbook. Under fire from well-organized opponents who have hammered the retailer with criticisms of its wages, health insurance and treatment of workers, Wal-Mart has quietly recruited former presidential advisers, including Michael K. Deaver, who was Ronald Reagan's image-meister, and Leslie Dach, one of Bill Clinton's media consultants, to set up a rapid-response public relations team in Arkansas.