Heather Howard (left) and Gillian Tisdale The Affordable Care Act, commonly known as “Obamacare,” was enacted 14 years ago this week. This landmark legislation made sweeping changes to improve access to and quality of health coverage: It expanded Medicaid, established marketplaces for consumers to easily shop for health insurance, banned insurers from discriminating against people with preexisting conditions, created subsidies for middle-class Americans and required most insurance plans to cover essential health benefits including preventive services, mental health and maternity care. It was controversial on its passage, but the ACA has proven itself resilient over the past 14 years, and…