^ Small potatoes. The annual cost of George W Bush's medicaid part D drug benefits was almost $50b in 2008, and the program currently has an unfunded liability of $20 trillion. The medicare liability is about $80 trillion, and the US has a total unfunded liability of $115 trillion, or $1.0m per taxpayer. The total net worth of all US citizens is about $50 trillion by comparison.
http://usdebtclock.org/