[TheMercenary]

The CBO reported in October 2009 reasons for the difference between the 2008 and 2009 deficits, which were approximately $460 billion and $1,410 billion, respectively. Key categories of changes included: tax receipt declines of $320 billion due to the effects of the recession and another $100 billion due to tax cuts in the stimulus bill (the American Recovery and Reinvestment Act or ARRA); $245 billion for the Troubled Asset Relief Program (TARP) and other bailout efforts; $100 billion in additional spending for ARRA; and another $185 billion due to increases in primary budget categories such as Medicare, Medicaid, unemployment insurance, Social Security, and Defense. This was the highest budget deficit relative to GDP (9.9%) since 1945. The national debt increased by $1.9 trillion during FY2009, versus the $1.0 trillion increase during 2008.

2/3rds of the increase was due to spending by this Congress, pretty commonly known.

http://en.wikipedia.org/wiki/United_...federal_budget