Those same church members assert that the only "official doctrine" is the Standard Works and official statements of the First Presidency, and that if some leaders said something that didn't come from those sources, it isn't "binding on the membership," and it isn't "canon" or "official doctrine."
However, an official statement of the LDS Church First Presidency issued on August 17, 1951, reads: click picture below to read more...
http://www.lds-mormon.com/racism.shtml
http://www.mormoncurtain.com/topic_racism.html
http://www.religioustolerance.org/lds_race.htm
http://www.i4m.com/think/comments/mormon-racism.htm
http://www.youtube.com/watch?v=z6oK2bFEeyU