Where Are The Figures?

A poster on the Daily Kos named Meteor Blades says the following:

"It wouldn’t take all that much money, as economist Doug Henwood has pointed out, to bring all the officially poor households up to the poverty line: 0.5 percent of gross domestic product, or just over 3 percent of the income of the richest fifth of American households. Maybe 5% to bring everybody up to "a civilized standard."

I'm interested in knowing where this quote is from. Is it true? I wish people would include references, especially when they are essentially claiming arguments based on numbers.