(Leaving aside the fact that I don't approve of Bush's general spending performance any more than you do)

I don't have any pretty pictures to make my point, but $87 billion is about 11 days worth of the annual Federal budget.

$315 billion would run the government for about five and half weeks.

$315 billion, spent in Iraq over five years of war, would pay for Social Security and Medicare for a bit over three months.

Social Security and Medicare spend the equivalent of the entire Iraq/Afghanistan war four times a year. Every single year. The amount spent on these things annually exceeds not only the annual defense budget, but the amount spent on every discretionary budget category combined. Space program, highways, national parks, you name it.

The war will be over in a few years, one way or another. The other expenses will keep going, and growing, for ten years, twenty years, fifty years and beyond. From CBO testimony in front of the Senate:

Over the past four decades, Medicare’s and Medicaid’s costs per beneficiary have increased about 2.5 percentage points faster per year than has per capita gross domestic product (GDP).1 If those costs continued growing at the same rate over the next four decades, federal spending on those two programs alone would rise from 4.5 percent of GDP today to about 20 percent by 2050; that amount would represent roughly the same share of the economy as the entire federal budget does today.