The liberals are complaining that America has an unequal distribution of wealth, and this is not true. It is now proven so discussed in a book and at this article.
http://economix.blogs.nytimes.com/2011/01/31/the-haves-and-the-have-nots/

Notice how the entire line for the United States resides in the top portion of the graph? That’s because the entire country is relatively rich. In fact, America’s bottom ventile is still richer than most of the world: That is, the typical person in the bottom 5 percent of the American income distribution is still richer than 68 percent of the world’s inhabitants.
The household income numbers are all converted into international dollars adjusted for equal purchasing power, since the cost of goods varies from country to country. In other words, the chart adjusts for the cost of living in different countries, so we are looking at consistent living standards worldwide.