After successful early growth of the [Wendy’s] chain, sales flattened as the company struggled to achieve brand differentiation in the highly competitive fast-food market. This situation would turn around in the mid-1980s. Starting on January 9, 1984, elderly actress Clara Peller was featured in the successful “Where’s the Beef?” North American commercial campaign for Wendy’s. Her famous line quickly entered the American pop culture (it was even used by Walter Mondale in a debate with Gary Hart in the Democratic primary election) and served to promote Wendy’s hamburgers. Peller, age 84, was dropped from the campaign in 1985 because she performed in a commercial for Prego spaghetti sauce, saying she “finally found” the beef. Peller was soon after replaced by Wendy’s founder Dave Thomas himself.