Think Progress misses the most interesting 
part of this exchange:
THE PRESIDENT: Let me ask you something about the Thrift Savings Plan. This is a Thrift Savings Plan that has a mix of stocks and bonds? 
MS. WEBSTER: Yes, sir. 
THE PRESIDENT: Now, how hard was that to learn how to do that? 
MS. WEBSTER: And I chose the safe plan, government bonds. (Laughter.) 
THE PRESIDENT: That's all right. Well, not so safe, unless we fix the deficit. But other than that -- (laughter). We're fixing the deficit. (Applause.)