sc_poverty_unstyled.geojson contains South Carolina's counties, with a poverty index. To create a choloropleth viewable in a gist, we can use geocolor.
var fs = require('fs'),
geocolor = require('geocolor')
var geo = JSON.parse(fs.readFileSync(__dirname+'/in/sc_pov.geojson'))
geo = geocolor(geo, 'poverty', 'quantile', 7, ['blue', 'red'])
fs.writeFileSync(__dirname+'/out/sc_pov_choloropleth.geojson', JSON.stringify(geo))