CP+B, Digitas Win Promo Grand Prix for AmEx's Small Business Saturday

U.S. agencies score early win

CANNES, France—U.S. ad agencies got off to a good start at Cannes on Monday, with Crispin Porter + Bogusky and Digitas winning the Grand Prix in the Promo & Activation Lions contest for an American Express campaign designed to give small businesses a boost during the holiday shopping season.