Are you done with your Christmas shopping yet? If you are, you're not alone. After having a bang up Thanksgiving, seasonal retail sales have taken a huge dive. According to the Department of Commerce, sales fell 2.4 percent in the first two weeks of December, the biggest drop in that Christmas sales time slot since 2005. Are Americans done with their shopping? Louise Story is Wall Street and finance reporter for our partner The New York Times. She tells us what's behind the new retail numbers.