Earlier this month, we used DirigoChoice in Maine as an example of the disaster a public-plan health-care reform can generate. Cato Institute looks a little farther down the coast to Massachusetts, where the state began its own health-care reform complete with individual mandates and a government plan. Cato calls it an “almost perfect” mirror of ObamaCare, complete with promises of reducing cost and extending care — that failed in both respects: Massachusetts reduced its uninsured population by two-thirds — yet the cost would be considered staggering, had state officials not done such a good job of hiding it. Finally, Massachusetts...