The quote was from DeLong’s rave review of The Accidental Theorist.  The next sentence reads:

But all these are outweighed by one fact: he is
almost always–not always, but almost always–right.

Even in 1999, that was a stretch.  By 2009, what non-Democratic thinker denies the consequences of the long-standing epistemic faults that Krugman’s best admirer acknowledged a decade ago?