If you broke down political support within those urban areas by economic factors you'd find opposition to the President and his hardline immigration tactics is
stronger in the poorer areas.
Basically you've gotten your analysis of this exactly wrong from the get-go. Whether you look at it broadly by city/state, or get out a microscope and went
precinct by precinct, the bottom line is that the people who live and work with the higher proportions of immigrants (both documented and undocumented) tend to have the most "liberal" perspective on immigration. And it's not particularly close.