0 can memorize answers but he cannot memorize answers to followup questions or statements. Biden will have the same problem this coming week. Both 0 and Biden tend to shoot from the hip and expose themselves and fail when faced with real questions.
However, if actually required to create thought and utter it de novo, one must truly have a firm grasp of the subject, and know what thet need to say.
In this regard, Obama and Biden fail, because what they say has nothing, absolutely nothing to do with what they believe and plan on putting into place.
Without a teleprompter obama is always doomed.He will be left with filibustering and change the topic in hopes of getting the audience to chime in and sliding on that.
I think the best we can hope for vrs Biden is a tie. Biden is a highly successful aggressive liar. Pretty tough to win a debate with a hyper arrogant jerk like Biden who simply makes it up as he goes along.