At the low end of the spectrum, it's not actually possible for the so-called "Working poor" to pay less than they do now, thanks to EIC all that can change is how much of a transfer payment they get from that top 10%. In order for Obama's tax plan to work there would have to be a massive downward definitional change in the meaning of the word "Rich" which means that the upper half of the middle class is in for a major hose job and the really-rich should think about divestiture and offshore retirement.
They won't tell you directly, but most democrats start the definition of "rich" at about $40 grand.........
You are also correct about the top tier, as in the bad old days of 70% brackets, these folks will find a way to go offshore, or simply move investments into tax exempt areas, resulting in a significant loss of available growth capital.....whereupon the government, not getting the desired revenue level from the tax increase, will revise the increase downward into the middle class.....the rationale being, of course, to "lessen the gap between rich and poor".....so ultimately the middle class will get screwed......happens every time....
doc