The law has succeeded in getting more people insured. The state's uninsured rate dropped to 6.6 percent in 2015 from 10.2 percent in 2013, according to the U.S. Census Bureau. Before the Affordable Care Act of 2010, about 14.5 percent lacked insurance, according to estimates from the Hilltop Institute at the University of Maryland, Baltimore County. Some state residents remain ineligible because they are undocumented immigrants.