Hey! Obama! Look at Illinois's "Amazon" tax. For the year after it took effect tax receipts in that category went down about 33%. I imagine there are other unintended negative consequences too.
Now to congress: Get real! Everyone making $10^6 or more shelters their income and the "Buffett" tax will probably have all the same unintended negative consequences for tax receipts that the Amazon tax did for Ill. Of course I don't need to tell you about that, because you are all millionaires at the very least !