Our experiment wasn't perfect," said former Governor Mitt Romney, speaking to an audience of New Hampshire Republicans about the Massachusetts health-care overhaul he signed in 2006. "Some things worked; some things didn't. Some things I'd change." Well, fair enough, though it's a lot easier to say what didn't work than what did. Five years ago Romney confidently predicted that under the law he and Senator Ted Kennedy collaborated on, "the costs of health care will be reduced." But the price of health coverage in Massachusetts is rising faster than ever -- premiums for individual insurance policies are up 6 percent more...