John Tamny, the free-market economics commentator who edits RealClearMarkets , comes out swinging in The Deficit Delusion: Why Everything Left, Right, and Supply-Side Tells You About the National Debt Is Wrong . Perhaps this isn't surprising, given the book's title. It can feel like Tamny is a kid walking through the elementary-school playground, randomly shoving other kids—some of whom are bigger than he—as he attacks one op-ed writer after another for, allegedly, misunderstanding the national