This time out of New Jersey. But we've seen this issue pop up with Trutanich, Gillibrand, and others. Legislators are increasingly under duties to disclose financial ties, but lawyers generally keep their mouths shut about such things. Clients have an interest in not being dragged into partisan campaigns, but the public has an interest in knowing about potential conflicts and, if they care to, can draw moral conclusions about the candidate's choice of clients.
The linked article does a nice job of describing how some states are regulating this issue and how they do or do not accommodate the traditional norms of confidentiality.