The deficit is more a revenue problem than a spending problem.

Felix Salmon explains.

In my no-financial-crisis, no-bailout, no-recession, no-stimulus scenario, spending kept growing at 6.22% a year, and revenue kept growing at 3.45%. You can see from the difference between the two numbers that this was an unsustainable path. But it clearly could have been sustained for a few more years.

Where would it have left us in fiscal 2010? With $2.843 trillion in federal revenue and $3.270 trillion in spending, leaving a deficit of $427 billion. The actual revenue and spending totals for 2010 were $2.162 trillion and $3.456 trillion. So spending was $186 billion higher than if we'd stuck to the trend, and revenue was $681 billion lower. In other words, the giant deficit is mainly the result of the collapse in tax receipts brought on by the recession, not the increase in spending. Nice to know, huh?