Obama's energy totally shifted on the joke about his middle name.
I do this for a living. His energy totally shifted for a few moments as he delivered the joke about wishing he could use his middle name. He went into a genuine (though masked) pissed off subconscious stance. The truth in the joke (which of course was written by a writer) really affected him as it was delivered and he could not control his subconscious reaction, because of course, it is the subconscious. Could anyone else also notice that momentary shift? Seriously, it was not subtle at all. That shows anger about a perceived prejudice he feels America as a whole has towards who he is, almost as if it is an attack on him and his culture and beliefs.
Obamas speech here starting at 4:55
http://www.youtube.com/watch?v=jtzKXw-aZ7M&feature=player_embedded#!