According to the Congressional Budget Office's January 2009 estimate for fiscal year 2009, outlays were projected to be $3,543 billion and revenues were projected to be $2,357 billion, leaving a deficit of $1,186 billion. Keep in mind that these estimates were made before Obama took office, based on existing law and policy, and did not take into account any actions that Obama might implement.
Therefore, unless one thinks that McCain would have somehow or other raised taxes and cut spending (with a Democratic Congress), rather than enacting a stimulus of his own, then a deficit of $1.2 trillion was baked in the cake the day Obama took office. Any suggestion that McCain would have brought in a lower deficit is simply fanciful.
Now let's fast forward to the end of fiscal year 2009, which ended on September 30. According to CBO, it ended with spending at $3,515 billion and revenues of $2,106 billion for a deficit of $1,409 billion.
To recap, the deficit came in $223 billion higher than projected, but spending was $28 billion and revenues were $251 billion less than expected. Thus we can conclude that more than 100 percent of the increase in the deficit since January is accounted for by lower revenues. Not one penny is due to higher spending.
It should be further noted that revenues are lower to a large extent because of tax cuts included in the February stimulus. According to the Joint Committee on Taxation, these tax cuts reduced revenues in FY2009 by $98 billion over what would otherwise have been the case. This is important because the Republican position has consistently been that tax cuts and only tax cuts are an appropriate response to the economic crisis.
If God were really a teabagger, Bartlett would be smited for such apostasy.