In this case, the blogger being Steve Landsburg (and the worm being…).
Recently Krugman wrote a post ripping Eric Cantor, which purported to show that standard economic reasoning rejected Cantor’s calls to pay for disaster spending with budget cuts elsewhere. What jumped out at me right away was that Krugman’s blog post relied on an assumption that two weeks ago, government spending and taxing policies were optimal. That was a pretty funny assumption for Krugman of all people to be making.
I was going to wait for unexpectedly good economic news (there are 8 such stories per day on CNBC, along with 8 such stories of unexpectedly bad economic news), link to the story, and then write up a fake Krugman post where he claims that now we can reduce unemployment benefits and other transfer programs, in order to reduce the deficit. This is because the day before the unexpectedly good news, the marginal benefits and costs of government policies were just right, and so after the good news the marginal costs of deficit spending were higher than the marginal benefits, etc. Thus basic economics, according to Nobel laureate Paul Krugman, demanded fiscal austerity on the margin.
But, no need to do all that now. Steve Landsburg beat me to the punch.