During the years that I was on faculty at the University of Chicago, my graduate students in political science often took courses with Professor Obama. They universally reported that he was a fair, but exceedingly tough practitioner of the Socratic method. He was willing to entertain any idea, question or observation, no matter how outrageous. But he always subjected the students to a series of logical interventions and arguments that often left students exhausted and sometimes a bit embarrassed. They quickly learned to challenge Professor Obama only if they had fully considered the implications of their arguments and prepared significant evidence in support of their case.
Source: marthaq