, Stephen A. Cozen, Cozen O’Connor (Philadelphia), Philadelphia, PA, for Plain- tiffs. David P. Gersch, Arnold & Porter, L.L.P., Donna M. Sheinbach, Michael D. McNeely, Nancy Luque, Steven A. Mad- dox, Gray Cary Ware and Friedenrich LLP (DC), Mitchell Rand Berger, Ronald Stanley Liebman, Patton Boggs LLP (DC