There's a blog post on how we did it here: http://www.propublica.org/nerds/item/the-rainbow-connection-how-we-made-our-cdo-connections-graphic http://www.propu

There's a blog post on how we did it here: http://www.propublica.org/nerds/item/the-rainbow-connection-how-we-made-our-cdo-connections-graphic http://www.propublica.org/nerds/item/the-rainbow-connection-...