The initial goal is to stop Congress from repealing the law without simultaneously passing a replacement for some 20 million people covered through subsidized private health insurance and expanded Medicaid. On the list are the NAACP, liberal advocacy groups like Families USA and the Center on Budget and Policy Priorities, the Service Employees International Union, which represents many health care workers, and the Center for American Progress, a think tank closely aligned with the Obama White House. Coordinating the group's activities will be Leslie Dach, a former Wal-Mart lobbyist who served as a top adviser to Health and Human Services Secretary Sylvia Burwell in the Obama administration. Republicans, who are considering first voting on repeal and then passing a replacement later, say their goal is a smooth transition to a system that will provide access for all Americans with fewer government requirements.