At one time, I read some article or something about how offensive it was to African-Americans for homosexuals to compare their fight for what they falsely imagine to be "equal rights" to the civil rights movement in this country. For an example of this, watch this video (with the relevant part at the 3:42 mark):
This is why states that have put amendments recognizing only traditional marriage up to a vote have found that African-Americans largely vote in favor of them.
Anyway, I can't find where I read this. Can anyone else help?