For folks to argue that Obama hasn't been able to implement demand side or Keynesian economics, remember that Keynes said in times of economic slowdowns to deficit spend and lower taxes. Well, Obama has added $5 trillion to the national debt. Obama cut taxes for the poor (and all) via sending them checks, a reduction in the payroll tax, cash for clunkers, etc. Working with the Federal Reserve, interest rates have been cut to near zero and home loan rates are the lowest ever, resulting in a huge cut in homeowners monthly payments - which is like a huge tax cut.
None of that has worked. He has been able to do what he wanted to do and what Keynes would want to do. It hasn't worked.
Time to go back to supply side, like Reagan.