“Think of the farm bill. Think of the Medicare drug benefit. Think of the steel tariff. Now expand that to the size of Social Security...” So says a former Council of Economic Advisers staffer to Brad DeLong on the likely shape of a Social Security reform bill. We could go on: think of the Iraq War, think of the Transportation Safety Administration, think of the Department of Homeland Security, think of the Patriot Act, think of No Child Left Behind, think of...