In his column today, New York Times columnist Paul Krugman makes an underappreciated point — conservative moaning about Bush’s big spending ways fail to take into account the fact that the deficit is largely driven by tax cuts and defense spending, not discretionary programs:

Well, it’s safe for conservatives to criticize Mr. Bush for presiding over runaway growth in domestic spending, because that implies that he betrayed his conservative supporters. There’s only one problem with this criticism: it’s not true.

It’s true that federal spending as a percentage of G.D.P. rose between 2001 and 2005. But the great bulk of this increase was accounted for by increased spending on defense and homeland security, including the costs of the Iraq war, and by rising health care costs.

Conservatives aren’t criticizing Mr. Bush for his defense spending. Since the Medicare drug program didn’t start until 2006, the Bush administration can’t be blamed for the rise in health care costs before then. Whatever other fiscal excesses took place weren’t large enough to play more than a marginal role in spending growth.

So where does the notion of Bush the big spender come from? In a direct sense it comes largely from Brian Riedl of the Heritage Foundation, who issued a report last fall alleging that government spending was out of control. Mr. Riedl is very good at his job; his report shifts artfully back and forth among various measures of spending (nominal, real, total, domestic, discretionary, domestic discretionary), managing to convey the false impression that soaring spending on domestic social programs is a major cause of the federal budget deficit without literally lying.

But the reason conservatives fall for the Heritage spin is that it suits their purposes. They need to repudiate George W. Bush, but they can’t admit that when Mr. Bush made his key mistakes — starting an unnecessary war, and using dishonest numbers to justify tax cuts — they were cheering him on.

Here’s the key graphic from the Center on Budget and Policy Priorities that sums it all up (see source article for more):