Michael F. Cannon does a fine job refuting claims by  RomneyCare/ObamaCare supporters.

[Ezra] Klein, The New Republic‘s Jonathan Cohn, and others have taken a big step by acknowledging that RomneyCare is struggling. When they shift the blame to “the American health care system,” however, they obscure what’s really happening. As I closed my previous post: “RomneyCare and its progeny ObamaCare are attempts by the Left’s central planners to clean up their own mess. If Klein and Cohn want to defend those laws, pointing to the damage already caused by their economic policies won’t do the trick. They need to explain why government price & exchange controls, mandates, and subsidies will produce something other than what they have always produced.”