And what I would say about recent US government policy is that it has been bad when measured by either Keynesian OR monetarist yardsticks.
This is essentially because the massive growth of US financial obligations has gone ultimately to bailing out the large financial institutions rather than to any Keynesian job creation scheme. So essentially you have a situation where neither the free market nor government do anything to create jobs.
Krugman can legitimately say the Federal budget deficit as such is not high. What massively inflating is the "other obligations" - Fannie Mae bonds, student loan bonds, etc. Here we have massive "inflationism" (as Doug Noland would term it).
Krugman is a partisan so he's glossed over the unneeded spending of the bailout in later commentary but he did say "The longer we live with zombie banks, the harder it will be to end the economic crisis."
IE, the bank bailout is a massive money-hole where banks have become "zombie" entities that are neither "private" in the sense of being disciplined by the market nor "public" in the sense of having any obligation to the public. The present situation is one where the money that could go to either a stimulus or a tax-cut is shoveled to these "zombies" instead.