[3] From April 1993 to May 1995, he served as Deputy Assistant Secretary for Economic Policy at the Treasury Department in Washington, D.C.[2] As an official in the Treasury Department in the Clinton administration, he worked on the 1993 federal budget, the unsuccessful health care reform effort, and other policies, and on several trade issues, including the Uruguay Round of the General Agreement on Tariffs and Trade and the North American Free Trade Agreement.

While he continued to believe that "good incremental policies" might be superior, he concluded that they were politically unattainable because of the lack of Republicans willing to work toward such goals.

Instead, DeLong said that he favored "Medicare for all, funded by a carbon tax, with a whole bunch of Universal Basic Income rebates for the poor and public investment in green technologies."

"[7] DeLong is an active blogger on political and economic issues and media criticism.

[8] In 2022, he published Slouching Towards Utopia, an economic history of the 20th century from a Keynesian perspective.