So if you’ve heard otherwise, you’ve heard wrong.
One things is interesting about this little exchange, though. Instead of addressing his question (which isn’t so straightforward as it seems), Obama seems to imply that a second-year university student should be questioning conventional wisdom, but by the time they graduate they ought to come back around to conventional thinking.
This is a great way to avoid actually engaging any topic. Simply ask a demographic question, such as, “How old are you,” or ”What field is your degree in,” or “Do you prefer Star Wars or Star Trek?” Then respond, “Ah, that explains why you think that.”