BOCA RATON, FL – APRIL 10: U.S. President Barack Obama waves as he speaks on the economy at Florida Atlantic University on April 10, 2012 in Boca Raton, Florida. The President made the case for the Buffet Rule, a principle for fairness that ensures that millionaires pay at least the same effective tax rate as middle class families pay. (Photo by Marc Serota/Getty Images)