Income Taxes--New Economy--American Middle Class?

The "American Middle Class" usually pay their taxes.  Their donations are not high compared to income and much of the tax base used by the Federal government comes from funds paid by members of the American Middle Class.

Who has been laid off in the new economy?  President Barack Obama has spoken about generating new jobs, though those jobs seem focused at what is called the "lower middle class" (skilled craftsmen and craftswomen).  If income has fallen, there will not be as much income to pay taxes on and the income expected will not be showing up.