My personal experience is irrelevant here. But, for the record, I am white and live in a diverse, historically working-class neighborhood near downtown Durham, NC; a city which, through progressive and often minority-led leadership, has come a long way towards equal rights and decreased violence in the last decade.
But, back to the point at hand, I feel as if you examined the root causes of all of the "symptoms" that black communities are responsible for their own problems, you'll find a different story. Why do you think many children are without fathers (hint: massive racially disproportionate incarceration)? Why do you think gangster culture is rampant (hint: a record of law and policing not being on the side of residents)? Why do you think "self-promotion" in the form of music is so successful (hint: it resonates within the culture and is often seen as one of the only "honest" enterprises to better one's position)? It's easy to think having black people in positions of power would be helpful, and it probably is to an extent. But how is having a black mayor going to affect a school board intent on promoting de facto segregation via districts, a state-mandated court system that convicts or acquits based upon the level of legal counsel its defendants can afford, or an often "capitalism-based" planning system that places a high proportion of unsavory (or toxic) developmental "necessities" in low-income neighborhoods while simultaneously ignoring proximity to fresh food or affordable, responsive health care.
It's funny you bring up President Obama- his experience in black communities far surpasses mine and he has lots of important ideas about this that you should listen to.