That dark red band is what we shall now refer to as the "Butter Belt", or alternately "America's Girdle."
It's not surprising as well that there's some significant overlay with this income map without even trying too hard.
It can be complicated to find the right software. If you want easy maps, you may try something like https://www.espatial.com . GrassGIS and QGIS are supposed to be good, but they require a little patience to learn because they are open source and powerful tools (but tools that have basic assumptions that may be difficult to learn how to use appropriately) and lack documentation or lack clear documentation (for laypeople). you might also try looking into the free applications arcgisonline.com offers (they are the major GIS software that is normally used in the industry-- but you have to pay for it or be affiliated with a program with the correct licensing-- which luckily I have.)
you might try some of them listed here: http://gis.stackexchange.com/questions/24/what-are-some-free-and-open-source-gis-desktop-packages
stackexchange is probably also a good place to get pointers or ask questions. there's also a /r/gis
While the exact reasons for the correlation may be more nuanced than party lines, the map of incarceration rates in the article looks a hell of a lot like a map of the election results from 2012.
The food problem is distribution, not demand. You'd need like 10 Africas to do the damage 1 USA does. The maps for consumption of any resouce ends up looking like this.