Medicare and Medicaid, the federal government's health insurance programs for the elderly and poor, play a big role in the health care reform proposals being considered on Capitol Hill. President Obama and Democrats in Congress hope to cut Medicare spending by nearly a half-trillion dollars over the next decade, and reform plans call for a big expansion of Medicaid during the same period. The proposals raise serious questions. Is it really possible to take so much money out of Medicare and not affect coverage? Is expanding Medicaid a good idea