The Demand Side Politics of Supply-Side Economics

The Demand Side Politics of Supply-Side Economics: "Following Jon Chait, Matt Yglesias writes:

...the central element of the Republican Party's tax policy -- lower taxes rates will lead to higher tax revenues -- is a discredited crackpot notion.

Fine, but a more fruitful question which I'd like to see Yglesias, Chait and others grapple with is why discredited, crackpot ideas can become central elements of a winning political party in the world's most important democracy.   Explain the demand side and give us your policy prescriptions."

(Via Marginal Revolution.)