The richest people in America command more wealth than entire cities combined.
By contrast, in 2007 the bottom 50% of U.S. households owned slightly more wealth than the Forbes 400; the economic meltdown has hurt the bottom more than the top. (And in fact, in 2010 the net worth of the Forbes 400 jumped to $1.37 trillion.)
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That top 400, by the way, represents .0000035 percent of all households in the United States.
Granted, many of the nation's top earners, including Bill Gates and Warren Buffett, contribute a tremendous amount of their wealth to charity each year, and will continue to do so. But many others, like Charles and David Koch, who contribute to a wide range of right-wing causes, are also actively fighting to weaken working-class rights (as they did in the recent Wisconsin union fracas).
On top of all this, it's worth mentioning that, of the 25 richest Americans, just three are women, and none is a person of color.