Seriously, though, why is this such a big deal? The Joe Biden f-bomb is barely audible. What happened is that Biden introduced Obama, and said "this is a big f*cking deal," into Obama's ear. It's not like he shouted the f-bomb or anything?
At any rate, listen very carefully to the Joe Biden f-bomb video and as he hugs Obama, you can barely hear it. A big uproar over nothing really, though Biden is known to be a victim of foot-in-mouth disease.