There's no such thing, fool. As soon as "Democrats" take over City Council and City Hall, the state cuts off all funding for infrastructure projects for to the City, focusing funding on the white suburbs and schools. The Republican State House declared the local governments "corrupt" and said that any money they got would be "missused". That's what happened in Flint. The Republican State legislature then took over municipal government, and sent in an Manager, because the water crisis proved how incompetent and corrupt the City government was.
The State Governments can do anything they want to the "Blue Cities" because they have no representation. Gerrymandering given supermajorities. The "Democrats" are never going to vote for Republicans, and as long as they control the State House, which is forever due to gerrymandering, the city residents will see the state continue to disinvest in the cities.