The ranks of the uninsured, the bankrupt and the long-term unemployed have all crept up the income scale, proving those problems aren't limited to the poor. Meanwhile, income inequality has grown. In 2001, the top 20 percent of households for the first time raked in more than half of all income, while the share earned by those in the middle was the lowest in nearly 50 years.

Within the middle class, there has been a widening divide between those in its upper reaches whose jobs provide the trappings of the good life, and those in the lower rungs whose economic fortunes are less secure.

The growing income gap corresponds to a long-term restructuring of the workforce that has carved out jobs from the center. In 1969, two categories of jobs -- blue-collar and administrative support -- together accounted for 56 percent of U.S. workers, according to an analysis by economists Frank Levy of MIT and Richard J. Murnane of Harvard. Thirty years later the share was just 39 percent.

Jobs at the low and high ends have replaced those in the middle -- the ranks of janitors and fast-food workers have expanded, but so have those of lawyers and doctors. The problem is, jobs at the low end don't support a middle-class life. And many at the high end require special skills and advanced degrees. "However you define the middle class, it's a lot harder now for high school graduates to be in it," Levy said.
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