Yuval Levin is the director of Social, Cultural, and Constitutional Studies at the American Enterprise Institute and the editor of National Affairs. He served as a member of the White House domestic policy staff under President George W. Bush and was a congressional staffer at the member, committee, and leadership levels. He is the author, most recently, of "American Covenant: How the Constitution Unified Our Nation--and Could Again." He holds a PhD from the University of Chicago.