More than one-fifth of the popu-lation of the United States was receiving Medicaid benefits before the passage of The Affordable Care Act (ACA). The ACA expanded eligibility to adults under the age of 65 who have income up to 138 percent of the federal poverty level. As originally written, the ACA relied on two provisions intended to entice and prod states to expand their Medicaid programs. So far, about half of the states have expanded their programs. The carrot enticing states to expand their programs is the generous federal participation. This year, the federal government will cover 100% of the...