The National Academy for State Health Policy is tracking state actions with regard to Medicaid expansion under the Affordable Care Act in its State Refor(u)m, an online network for health reform implementation.  The chart, which is updated regularly, has information on the percentage uninsured, the history of subsidized coverage, activity regarding the state’s Medicaid expansion in the executive and/or legislative branches, and fiscal and demographic analysis. 

Link: Medicaid Expansion Tracker