Definitely not DRY, but it's a start at a bivariate choropleth and automated scales.
Modified http://ajax.googleapis.com/ajax/libs/jquery/2.0.3/jquery.min.js to a secure url
Modified http://d3js.org/topojson.v1.min.js to a secure url
Modified http://d3js.org/d3.v3.min.js to a secure url
https://ajax.googleapis.com/ajax/libs/jquery/2.0.3/jquery.min.js
https://d3js.org/topojson.v1.min.js
https://d3js.org/d3.v3.min.js