Your support makes MPR News possible. Give Now What's happened to the middle class? Business St. Paul, Minn. · May 18, 2011 Listen 53min 53sec Welder at Atlas Manufacturing MPR Photo/Annie Baxter American politicians spend a lot of time talking about working for the middle class. But just who is the middle class? And is the political rhetoric doing anything to reverse a 40-year slide caused by stagnant wages and eroding job security?