State prepares in case of collapse of Commonwealth Care Alliance, insurer for 50,000 poor, elderly, and disabled people

State officials said this week they are preparing in case Commonwealth Care Alliance collapses, in an effort to protect the health care of the struggling insurer’ s nearly 50,000 elderly, disabled, and low-income members. State officials also said they may need to step in and help run CCA’ s two primary care clinics in Boston and Springfield, should the nonprofit…