// treemap raceparty boxes ; 
{
   "name": "raceparty",
   "children": [
      {
         "name": "Black precincts",
         "children": [
            {"name": "Democrats", "size": 174670},
            {"name": "Independents, Republicans", "size": 35326}
         ]
      },
      {
         "name": "Mixed precincts",
         "children": [
            {"name": "Democrats", "size": 85000},
            {"name": "Independents, Republicans", "size": 28795}
         ]
      },
      {
         "name": "White precincts",
         "children": [
            {"name": "Democrats", "size": 87033},
            {"name": "Independents, Republicans", "size": 43752}
         ]
      }
   ]
}