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Now Playing: Marketplace for 7/22/13 - Obama and the middle class

Eight years after laying out the challenges for America’s middle class, President Obama returns to Knox College in Illinois to revive his push for economic growth. The past eight years have also been some of the roughest for middle class Americans, if you look at a number of specific benchmarks. Also, is Detroit’s tumble into insolvency the future for other American cities? Or was Motor City just unable to reinvent itself, the way Pittsburgh and Cleveland have?