The following is an open letter to business leaders from Steve Case, chairman and CEO of Revolution LLC and co-founder of America Online; Ray Chambers, former chairman, Wesray Capital Corporation; Mike Eskew, former chairman and CEO, UPS; Bob Nardelli, former chairman and CEO, Chrysler and The Home Depot; and John Pepper, former president, CEO and chairman, Proctor & Gamble, encouraging all S&P 500 companies to join ~1@BODYURL[id=114kcurl733]@