Paul Krugman takes a long hard look at the economic impact of the “mortgage bubble”, who it happened to and why it happened…in a word, Greenspan.

Blindly Into the Bubble

Of course, now that it has all gone bad, people with ties to the financial industry are rethinking their belief in the perfection of free markets. Mr. Greenspan has come out in favor of, yes, a government bailout. “Cash is available,” he says — meaning taxpayer money — “and we should use that in larger amounts, as is necessary, to solve the problems of the stress of this.”

Given the role of conservative ideology in the mortgage disaster, it’s puzzling that Democrats haven’t been more aggressive about making the disaster an issue for the 2008 election. They should be: It’s hard to imagine a more graphic demonstration of what’s wrong with their opponents’ economic beliefs.