As usual, the most dangerous parts of ObamaCare aren't receiving the scrutiny they deserve—and one of the least examined is a new commission to tell Congress how to control health spending. Democrats are quietly attempting to impose a "global budget" on Medicare, with radical implications for U.S. medicine. Like most of Europe, the various health bills stipulate that Congress will arbitrarily decide how much to spend on health care for seniors every year—and then invest an unelected board with extraordinary powers to dictate what is covered and how it will be paid for. White House budget director Peter Orszag calls...