The country's second-largest health insurance company said Wednesday that it far outpaced its enrollment expectations last year, with most of that growth coming from the expansion of Medicaid in dozens of states. Insurance giant Anthem enrolled 1.8 million new customers in 2014, with nearly half of the new plans coming from Medicaid programs, its chief executive told reporters Wednesday. A total of 28 states have expanded their Medicaid programs in the last two years. The expansion of the low-income program is a major part of driving down the country's uninsured rate under the Affordable Care Act.