Obama signs Affordable Care Act, expanding Medicaid eligibility to 138% of poverty line

President Obama signs the Affordable Care Act (ACA) into law, which significantly expands Medicaid eligibility to all adults with incomes up to 138% of the federal poverty line, extending coverage to millions of childless adults who were previously ineligible. The law provides 100% federal funding for newly eligible enrollees through 2016, tapering to 90% thereafter. Medicaid enrollment surges from roughly 60 million to 80+ million over the following decade.