@Cycloptichorn,
Interest rates can only go up from where we are, and most likely will go up a lot, turning as much of our short term debt into long term debt before they do thus locking in the low rates is common sense. How this is supposed to boost the economy right now though I have no idea.
I am starting to hear a lot of chatter about the stupidity of locking away money long term by buying US debt at these low rates, that if the upside is less than 2% a year then why bother to take the chance that we move into a high inflation environment and thus loose a ton of money? Better the keep the money in cash, and be ready to roll once we figure out where this economy is going. Now is not the time to take any risk, to include US Bonds. Long term US Bond interest rates will move up soon I expect.