People from across the political spectrum use a lot of different words to answer the question of what happened to the middle class: Hollowed out, wiped out, disappearing, declining, doesn't exist anymore. But what's really happening to the middle class? What do the numbers say? We answer that question on this episode of Numbers Geek with Steve Ballmer. Learn more at usafacts.org and find more episodes at geekwire.com/numbersgeek.