I always thought states refusing to expand Medicaid was racially motivated. This NYTimes Piece gives me more evidence:
Gains for blacks were muted because they disproportionately live in states that chose not to expand Medicaid. About 60 percent of poor blacks live in states that did not expand Medicaid. While the share of poor blacks covered by Medicaid did rise by two percentage points in those states, the rate rose by six points in states that expanded the program.