According to this article in JAMA, the AGs serve as their States' legal officers with broad powers ultimately aimed at protecting the public interest in areas such as consumer protections, the environment, and the functioning of various State agencies as well as representing the State when lawsuits arise. When they speak, their opponents better listen. Examples of that include the tobacco wars, going after big pharma and defanging managed care.
What impressed the DMCB was how the issue had been legally processed by the "General." He read the law, benchmarked it against how he was trained to think and came up with a judgment. Writers write, doctors care and lawyers, well, "law." Principled individuals in these and other professions, including lawyers, can't help it. This sort of backbone is an under recognized ingredient in the battle over the ACA. It's also another reason to believe that the AG suit may prevail.
And now they're coming home.