Origins: It is true that Illinois senator (and Democratic presidential hopeful) Barack Obama has been associated with Chicago's Trinity United Church of Christ (a single church which is part of the United Church of Christ denomination) for about twenty years, and it is true that TUCC describes its congregation as "an African people" who remain "true to our native land."
Like I said, doesn't stop UCC and it's merry band of gay blades from claiming TUCC though.