There's a new leader of HealthSource RI, the state's health insurance exchange created by the Affordable Care Act.  Governor-elect Gina Raimondo is appointing Anya Rader Wallack to replace Christine Ferguson atop the exchange.  Rader Wallack currently is president of a Fall River-based health consulting company.  Raimondo says Rader Wallack brings the right mix of policy expertise, management skill and innovative thinking to this challenging position.