Ethnically Minority = Blacks I presume?
Because Sanders won the hispanic vote in many polls, NV, Illinois, Colorado & on & on & ran close in most states. He won the most diverse state in Hawaii, won Asian Americans in many places. He also won the Native American votes in Oklahoma, Alaska & in most states of reasonable Native American concentration.
The question should be why he did bad among the African American community because they are not the only ethnic minority group!
Come on Shadows, you know that Hawaii is a rural white state next to Vermont.