On the campaign trial, Gov.-elect John Bel Edwards promised time and again that he would expand the rolls of Medicaid on his first day in office. His promise to reverse repeated rejections of expanded Medicaid by Republican Gov. Bobby Jindal and open the government health insurance program to more low-income workers was a cornerstone of the Democrat’s campaign. But legal realities have caused Edwards to back off, at least for the time being, while his incoming administration works through a legal glitch raised by the Legislature’s fiscal advisers.