The truth. Union members and "African American" voters.
That is not exactly un-so, but the problem is really more about affluence. People flock to urban areas because of needs, financial and else (such as health care.)
Affluent people are essentially dependent for their affluence on the toil of others.
There are shared interests in keeping certain paradigms in place. Unfortunately, for many inner city persons the education possibilities are lacking. Hillary (for example) and the Dems are such blatant liars concerning education that it simply makes me want to hurl when I see them speak of such matters. They are liars of the highest order.
The Democrats are as always only interested in maintaining the plantation! They are the benevolent massas and they own the media machine for the time being.
Urban voters are delusional. They think that perpetuating the welfare state is in their best interests. A concern and even a cursory consideration of and for posterity would logicaly shatter that sort of myth.
Big Government is the absolute worst thing that has ever happened to Western Civilization. This is why the (currently Muslim) hordes are wreaking destruction upon our way of life. The effects are quite noticeable in Europe already, but the tidal wave of immigration and government largesse and social programs are soon to be unmistakable in the USA as well.