In this sleepy Mississippi River Delta town in eastern Arkansas, the community health center that opened in 2012 stands out among the downtown's mostly abandoned buildings constructed over a half century earlier. The 15,000 square-foot brick building with its two-story lobby and green awnings was paid for through a $2.8 million grant from the Affordable Care Act — a federal investment designed to ensure the nonprofit clinic could treat hundreds of additional patients, many of whom would gain health coverage under Obamacare. Now, though, Mid-Delta Health Systems is worried it won't have enough money to maintain services to low-income patients because of how the state is expanding Medicaid.