Quote from AAAintheBeltway:
There are two different requirements. One is to be a member of the Bar of the court in which you are appearing. Each federal district and appeals court have their own bar you must join if you appear there. Supreme Court as well.
There are also state requirements to be a member of the state's Bar Association to practice law in that state. The rules vary, but generally holding oneself out as a lawyer handling matters in the state would trigger the requirement. Occasional state court apearances would not, as you would get yourself admitted on motion to the judge for the purposes of that one case. But if you maintained an office in the state and held yourself out as practicing law, then you would need to be a Bar member.
This would be a matter for the state Bar Counsel to rule on. Clearly, they will say she didn't need a license, because she is a liberal democrat, and that is the way things work in Massachusetts. It would be interesting to know if the other faculty members who handled outside cases took such a casual attitude toward Bar membership though.
Do you think professors at the Harvard Medical School who treat patients take the position they don't have to comply with state licensing requirements for doctors? Doubtful.