Ranking congressional districts for gerrymandering.
http://bl.ocks.org/ashenfad/48b4621bd3a9f1bb884a
http://stackoverflow.com/questions/14565963/topojson-for-congressional-districts http://bl.ocks.org/mbostock/9656675 https://github.com/mbostock/us-atlas https://github.com/JeffreyBLewis/congressional-district-boundaries