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Today more than 28 million people, about a quarter of the workforce between the ages of 18 and 64, earn less than $9.04 an hour, which translates into a full-time salary of $18,800 a year -- the income that marks the federal poverty line for a family of four. (Alliance for Healthy Homes)

If you know of other good factual sources of information about this issue, post them as comments to this topic and I'll incorporate them.