I’m tempted to feel a certain degree of sympathy for Paul Krugman. As a leading proponent of the notion that bigger government stimulates growth (a.k.a., Keynesian economics), he’s in the rather difficult position of rationalizing why the economy was stagnant when Obama first took office and the burden of government spending was rising. And he also has to somehow explain why the economy is now doing better at a time when the fiscal burden of government is declining.