A right to health care

Where did the idea of "positive rights" enforceable by law become popular with the Catholic Church?

It takes some capital and labor to provide health care, education, clothing, food, shelter. These are essential for all, and the purpose of alms is to make a provision for people unable to purchase from their own wealth to obtain them.

I can understand committed socialists like Obama to advocate nationalization of health care as consistent with federal control of the economic life and liberty on the installment plan -- but why has the Church been so enthusiastic to embrace a federal bureaucracy -- one committed to promoting abortion, euthanasia, cloning, and rationing of health care.

I know ACORN is funded by the Campaign for Human Development which in turn is funded by donations collected at Mass from Church-going Catholics, but that's not even a significant part of the Church. Yet it seems all of the agencies of the Church with involvement in health care and the alleviation of poverty are on board with Obamacare and "positive rights".