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Box score: Troubling signs for the middle class

Political and civil efforts to help the middle

Political and civil efforts to help the middle class have grown nationwide. These delegates watch former President Bill Clinton addresses the Democratic National Convention on Sept. 5, 2012, in Charlotte, N.C. Credit: AP / Jae C. Hong

660 percent -- That's how many more assets the median upper-income American family had in 2013 than the median middle-income family -- the widest wealth gap between these groups in the 30 years the data have been collected.

The median high-income family had assets of $639,400, while the median middle-income family had $96,500. The wealth of upper-income families has doubled since 1983, but middle-income families have seen a rise of just 2 percent. Lower-income family wealth, at $9,300, sank more than 20 percent. It's a troubling trend.