In the good, old tradition of revolutionaries, Obama hides in plain print. So, before listening to his speech, it's worth while to note the following passages from his autobiography:
On p. 94-95 he describes an effective tactic to deal with White people:
It was usually an effective tactic, another one of those tricks I had learned: People were satisfied so long as you were courteous and smiled and made no sudden moves. They were more than satisfied; they were relieved - such a pleasant surprise to find a well-mannered young black man who didn't seem angry all the time.
OBAMA ON HOW TO TALK TO WHITE PEOPLE