Matt Yglesias, a Keynesian Progressive, is upset with Austrians fingering the Fed as the cause of the business cycle. Naturally, therefore, he is especially upset with the ideas of Mises and Rothbard. Why can't the Paulians be more reasonable, like the anti-Paul Koch Bros.? Those plutocrats--who also opposed the Mises Institute from before its founding, and Murray for years before that--get along with the regime. Indeed, they massively profit from it. Forget Mises and Rothbard: Mr. Yglesias would have us pay attention instead to Kochonomics and Milton Friedman, who said, like his patron Nixon, "we're all Keynesians now." In fact, young people are increasingly Austrian. Welcome to the Paulian future.
UPDATE Want to learn about Austrian economics? Here is a great place to start.