It wasn’t on a resume, just some campaign literature. A formal resume should carry formal titles of all paid positions held, and his formal title for this position was presumably “Lecturer” or some other term not containing the word “professor”. If he’d put on an actual resume that he was a “Professor” at the law school, I’d have a big problem with that, but for campaign materials there’s nothing wrong with use terms as they are normally used in informal speech and writing.
What is the purpose of a formal resume?
What is the purpose of a formal resume?