It started with free doughnuts.Sara L. Ellis was an undergraduate at Indiana University in 1991, majoring in political science and religious studies, with minors in Italian and art history.“So it made me qualified to do absolutely nothing,” she said.Ellis signed up for the LSAT on a lark — the people taking applications outside the political science department were handing out doughnuts — and she took the exam eight days later.It turned out she was qualified for law school. And after nearly 20 years …