The Geography of the Uninsured - Jim Gimpel
Here is a really fun and informative interactive map that shows the percentage of the state population that has no health insurance.
The top rate is over 40%. The lowest rate is 3.4%, but those lowest rates are all in Massachusetts where people are required by law to have it. The top rates are all in the border states, like Texas and California, where there are particularly high concentrations of illegal aliens. Almost all of the states with a rate of over 25% are Democratic districts.
My friend Matt Laslo at PRI (Capitol News Connection) put me on to this.
Here's an interactive map at NPR that distinguishes the numbers for uninsured children from those of adults under 65.