The University of Southern Maine apologized Wednesday for the “rogue behavior” of a retired professor who offered credit for participating in a protest against Justice Brett Kavanaugh, announcing that she has since been barred from teaching at the university. Susan Feiner, who retired in September but continued to teach some classes, offered students one credit for taking a pop-up course called “Engaged Citizenship,” which would bus students to Washington to participate in a protest urging Republican Sen. Susan Collins to oppose confirming then-Judge Kavanaugh to the Supreme Court.