Custom Choropleth Mapping

In working on the Medicare Advantage (MA) enrollment dashboard, I was asked if it was possible to recreate a choropleth map with MA penetration rates (enrolled/eligibles). With some more government data, a publicly available SVG map and the Inovista SVG controller, I was able quickly create a map showing all 3000+ counties. Here is my result, with two color themes. The first is referenced from Flowing Data Blog and the second was sampled from the original example.