Are there any racial/ethnic tensions between Hispanics and blacks in Chicago? With the massive segregation and voting for opposite candidates both times in a row makes me wonder.
Not as far as I know, though the only ones I know in either group are young activist types. The Hispanics mostly settled in former white ethnic neighborhoods which were less destroyed by urban renewal than a lot of the black ones -- I think this explains the segregation between the two more than any kind of mutual dislike.
IIRC Chuy Garcia (the mayoral candidate who ran against Rahm) actively supported Bernie.