Carolyn E. Shapiro won’t ever forget the first day of her First Amendment class in law school, when a professor named Elena Kagan singled her out — by name — to answer a question. It was 1993, and she was in her second year at the University of Chicago Law School. The class seating chart hadn’t even been finished yet. “That kind of scared me,” Shapiro said, recalling the feeling but not the question itself. “But it was the very first day of First Amendment class. I did not …