Bill Martin, co-founder of ShopperTrak, which tracks data at 70,000 stores globally, is expecting a sales increase of 3 percent to 5 percent to $2.57 billion to $2.62 billion on Thanksgiving. The National Retail Federation expects 25.6 million shoppers to take advantage of the Thanksgiving openings, down slightly down from last year. Kathy Grannis, a spokeswoman at the retail trade group, said that earlier promotions in the month and shoppers' uncertainty about when they can get the best deals are factors that could lead to fewer shoppers coming out on the holiday. "At GameStop, we often use the phrase 'protect the family' in reference to our business," the video game retailer said in a company statement. A number of petitions have been circulating on change.org targeting Wal-Mart, Target and other retailers for opening their stores on Thanksgiving, or starting their sales that day.