If you were led blindfolded a few blocks east from Los Angeles' grand City Hall, you would know instantly when you entered Skid Row. There is the pungent smell of urine and marijuana smoke, and the sound of music and easy laughter — a carnival rising out of misery. This is the chaos that Chris Mack plunges into on most days. Once homeless himself, Mack is an outreach worker for the JWCH Institute's Center for Community Health, a free clinic in the heart of Skid Row. Mack is part of a concerted push to enroll the nation's homeless in Medicaid.