This clip, less than 5 minutes long, is worth watching. To sum up: the interviewer acts surprised that there are any black Mormons and then tries to determine whether they are “more Mormon” or “more black.” The clip ends with the black Mormons disagreeing on politics, which is pretty much what you would expect.
Here is another link:
http://www.thedailyshow.com/watch/tue-october-9-2012/the-black-mormon-vote