Robert Samuelson on "The Public Plan Delusion."

The promise of the public plan is a mirage. Its political brilliance is to use free-market rhetoric (more "choice" and "competition") to expand government power. But why would a plan tied to Medicare control health spending, when Medicare hasn't? From 1970 to 2007, Medicare spending per beneficiary rose 9.2 percent annually compared to the 10.4 percent of private insurers -- and the small difference partly reflects cost shifting. Congress periodically improves Medicare benefits, and there's a limit to how much squeezing reimbursement rates can check costs.