This is just the very definition of inept. How the President of the United States cannot tell you what the current national debt is, is just humiliating. And David Letterman is damn near as bad. $10 trillion David?!?! Yeah, 4 years ago. Both of these men are an embarassment to America. No wonder the debt is skyrocketing, Obama isn't paying any attention to it...
http://www.glennbeck.com/2012/09/20/obama-on-letterman-doesnt-know-debt-clock-numbers/
http://www.glennbeck.com/2012/09/20/obama-on-letterman-doesnt-know-debt-clock-numbers/