Massachusetts' Commonwealth Connector health reforms have reduced the state's uninsured population to less than 3% of residents, the lowest among all states. But a recent survey found an uptick last fall in adults reporting difficulty accessing certain types of care. The outcome of the Massachusetts health system reforms has national implications. Democrats in Congress have offered or are drafting health reform bills based on many of the state-adopted principles, including a health insurance exchange, subsidized private health insurance for low-and moderate-income residents, a requirement for individuals to have health insurance, and a mandate for employers to offer health insurance to...