(Ezra Klein/Todd Lindeman)

The key is fiscal year 2009 -- and who you blame for it. By any measure, spending popped that year. If you’re looking at raw dollars, it rose by $535 billion. And “the 2009 fiscal year,” writes Market Watch’s Rex Nutting, “which Republicans count as part of Obama’s legacy, began four months before Obama moved into the White House.”

That’s true: The federal fiscal year stretches, somewhat weirdly, from October to September. So fiscal year 2009 began in October 2008.

And that’s the point of Nutting’s analysis: if you attribute most of fiscal year 2009 to George W. Bush then, after adjusting for inflation, federal spending under Obama has actually dropped by 0.1 percent. Politifact checked the numbers and agreed: “Using raw dollars, Obama did oversee the lowest annual increases in spending of any president in 60 years,” they write. “Using inflation-adjusted dollars, Obama had the second-lowest increase -- in fact, he actually presided over a decrease.” Here’s Nutting’s graph:

(Rex Nutting/Market Watch)

But I’d point out that this entire conversation is nonsense. So far, we haven’t mentioned the only fact that really matters, which is that the economy began to collapse in late-2008, and continued to crater through much of 2009. Or, as Donald Marron, director of the Tax Policy Center, puts it, “the real issue is that 2009 is an anomaly driven by crisis.”

That there’s an implicit taunt in this debate just goes to show how blinkered our fiscal conversation has really become. It was proper that spending jumped in 2009. If the Ghost of Ronald Reagan had occupied the Oval Office, spending would have jumped in 2009. That’s just what happens when you hit a once-in-a-generation recession.

It is proper that, since 2009, spending has remained high in order to support a badly wounded economy and help unemployed workers and struggling families. The question isn’t which president to blame for elevated spending in 2009 -- the blame there goes to the financial crisis, though Republicans conveniently forget that in order to score points. The question is where should spending be now?

”Obama chose not to reverse that elevated level of spending,” writes Jim Pethokoukis, a blogger for the conservative American Enterprise Institute, “thus he, along with congressional Democrats, are responsible for it. Only by establishing 2009 as the new baseline, something Republican budget hawks like Paul Ryan feared would happen, does Obama come off looking like a tightwad. Obama has turned a one-off surge in spending due to the Great Recession into his permanent New Normal through 2016 and beyond.”

That last line, by the way, isn’t true. Obama’s budget plans to bring spending down to 22.5 percent of GDP in 2016 -- which is about where it was in the Reagan years, and our demographics are worse now than they were then. But Pethokoukis’s broader point is correct: The real debate here is what spending should have been in 2010 and 2011.

The Obama administration wanted it to be higher. After all, unemployment rose through 2010, and remains high today. It has proposed a raft of additional stimulus bills since 2009. Republicans in Congress, however, refused to pass most of their plans. Properly understood, the fact that inflation-adjusted spending has fallen since fiscal year 2009 is the result of Republican obstruction in Congress. That Democrats are now crowing about these numbers -- the DNC is e-mailing them around -- and that Republicans are now viciously disputing them is an embarrassment to both sides. You could as easily imagine Democrats lamenting these numbers as evidence of our failed policies and Republicans celebrating them as evidence of their congressional successes.

But Republicans don’t want to admit that they bear substantial responsibility for the economic policy of the last few years. If they did, then it would be hard to argue that the economy’s performance in 2010 and 2011 is all Obama’s fault. And the Obama administration doesn’t want to clearly say that we should have been spending more in recent years, even if that’s what they believe, and what they proposed, because it polls poorly. And so here we are.

Related: Doing the math on Obama — and Bush’s -- deficits.