There have been several stories in recent days hitting mainly internet outlets decrying Barack Obama's "blackness." This is beyond rhetorically silly, and every news outlet that has printed such will soon see why.
For all the "polls" and prominent black leaders that are quoted in each of these pieces there are equal amounts of data that are being ignored.
If you want to see how Obama relates to the African American community directly go talk to Chicago South Siders. There is not a more proud black community in all of America than the geography that is home to Jesse Jackson, Muhammed Ali, Malcom X College, and the Rainbow/PUSH Coalition. Obama carried the south side, the west side, and every predominantly African American south suburb in his bid for the U.S. Senate - and did so even in the primary against 8 other democrats in devastating fashion.
In fact in the Senate race primaries - Obama garnered more votes in the primary than all of the GOP candidates combined, and more than all the rest of the Democratic field combined. (Driven by extremely high turn-out in predominantly heavy urban Chicago districts.
See also the definitive post on Why Obama will be President.