“After vanquishing the so-called millionaires tax, the state’s business groups have an arguably tougher fight on their hands: reining in the expenses of subsidized health care. One day after a court ruling killed a proposed tax increase on high earners, three of the business groups that sued to block the proposal turned their attention to the state’s Medicaid program (aka MassHealth). … This budget-buster as well as debt service and state retiree benefits threaten the state’s fiscal health, Ain told council members. …”