I always thought America was about some sort of social equality where all had equal rights and human dignity. Equality of wealth and income is another whole kettle of fish. A good piece by Kaus in Newsweek:
There are two big questions to ask liberal opponents of income inequality. 1) What, exactly, is it about greater economic inequality that's so bad? and 2) What you gonna do about it?
It's worth reading. One of the constants I find in Lefty writings (not in Kaus) is the assumption that wealth and income is zero-sum, like slices of a pie. That is, that there is a set total amount of income and/or wealth in the world. Whether they write that way to fool the ignorant, or really believe it, I do not know.
I suspect the former.