Lots. Right now that money is available, but being hoarded by fearful banks. Dump it into the economy, increase the velocity of money (because now everyone feels wonderful, the "good times" are back, etc.), and you've got a recipe for a vicious inflation.
Add the proposed stimulus packages that Barackula wishes to give to the American people. I see the writing on the wall, well now it’s more akin to a warning siren.