It looks the the blue towers represent all of the high rise ghettos where Ketchup Boy gets the bulk of his votes such as the Cabrini-Green and Robert Taylor housing projects here in Chicago.
Must be too early; trying that again:
It looks as if the blue towers represent all of the high rise ghettos where Ketchup Boy gets the bulk of his votes such as the Cabrini-Green and Robert Taylor housing projects here in Chicago.