In this excellent rebuttal, Dick Morris explains what Mr. Cain should have during the debate. He makes a very compelling argument as to why Herman Cain's plan would work, and should be considered much more broadly.
Please check out Mr. Dick Morris' excellent website offering all manner of political commentary at: http://www.dickmorris.com
In short, Herman Cain's tax plan is extremely bold, would create millions of new jobs, and would blast the economy into a tremendous growth phase. So said Art Laffer, who helped architect Ronald Reagan's economic plan. 999 absolutely WILL NOT raise taxes on the poor, and it IS NOT regressive.
If you're not familiar with the plan, then please read it here: http://www.hermancain.com/999plan