mentalfloss, I do not quote Rassmussen any more, because I have been told several times by uninformed miscreants that Rasmussen is a water carrier for the Republican Party. So, to avoid any confrontation, even though I know that Rasmussen is the most relible, objective and accurate polling firm, I don't bother to change the unchangable idiots.
Here is a collection of recent polls:
RealClearPolitics - Election Other - President Obama Job Approval
I still don't see any mention of a recent poll which takes into account the black perspective. The latest data is from May 2009.
Also, looks like he had a pretty good approval rating all through his presidency until July, everything went red. That seems a bit suspect to me. It doesn't appear to be a clear indicator of his performance when the only real disapproval occurs near the mid-terms.