Even as calls for “Medicare for All” grow louder among Democrats in Washington, D.C., at least 10 states are exploring whether to allow residents to pay premiums to “buy in” to Medicaid, the federal-state health care program for the poor. Advocates say the policies might be an appealing option for people hard-pressed to pay for plans on the health care exchanges, and might spur competition that could lower prices for everybody. (Michael Ollove, Stateline)