It’s time like these when I miss Jennifer Jaff the most. Jennifer was the executive director of the Farmington-based Advocacy for Patients with Chronic Illness, Inc., and a member of an advisory committee that is helping build the state’s health insurance exchange, the online marketplace for people buying insurance as mandated by the Affordable Care Act. When Jennifer died in September – she’d been living with a variety of ailments, including Crohn’s disease — she left a huge hole in the state’s safety net. Her board is holding a memorial service for her on Dec. 9 at Hartford’s Old State House, and if just a small portion of the people she helped show up, the building won’t be big enough. We need her now, during the state’s organization of its exchange.