Herman Cain Schools Hecklers in American Exceptionalism

“If this is not the greatest country in the world, why is it that our economy is 25% of the world GDP?
If it’s not the greatest country in the world, why do we have more freedoms and liberties than anybody else?
If it’s not the greatest country in the world, how is it that this nation was able to become the power that it is militarily and economically in the short 236 year history, relative to the history of the rest of the great nations in the world?
If it’s not the greatest country in the world, how is it possible to have a black man in the White House?

If this is not the greatest country in the world LEAVE!!!”