This has nothing to do with Mormonism. The Klan was a tool of the Democrat Party from its inception. Harry “lightskinned” Reid and Rod “I am blacker than Obama” Blagosomething are leftists and leftists are racists to their very core. What is more leftist than thinking black people can’t get through a day in life without the helping hand of leftists?
I don't think the Mormons have believed any differently on this subject than the vast majority of American religions.