Every journey truly begins with that first single step !
It's not isolated. It's pretty widespread. As was stated upthread, many (if not most) well educated, enterprising blacks who gave Obama their vote in 2008, have literally been shamed by his awful performance in office. They thought he would finally bring some dignity to the image of black people, but he did nothing of the kind.
If anything, he's set the public relations of black people back by decades, and a lot of blacks are seriously feeling betrayed about it. The man is a complete embarrassment to them. He's shown himself to be incompetent, weak, indecisive, divisive, petty, irresponsible, vindictive, juvenile, and truly uncaring.
Blacks watched Congress write him a check for nearly a Trillion Dollars to stimulate the economy, and didn't see a single dime trickle down into their neighborhoods, businesses, etc. But they sure did see Wall Street and GM get bailed out. Don't think for a moment that they didn't react to that.
Many blacks are also deeply religious, and didn't take kindly to his 'evolving' stance on gay 'marriage', or the fact that he always seems to have a kind word for Islam, but rarely for Christianity. He's no different than any other sweet talking con man they've run across, and that's exactly how many now see him.