CNN.com: Why Medicaid expansion is key part of health reform

Aaron E. Carroll, MD, MS is co-Editor-in-Chief of The Incidental Economist and tweets at @aaronecarroll. He is the Chief Health Officer at Indiana University. He is also a Distinguished Professor of Pediatrics and Associate Dean for Research Mentoring at the Indiana University School of Medicine. In addition to contributing regularly to The New York Times and the Atlantic, he is the author of four books, most recently The Bad Food Bible.