Also, I'm playing around with new color schemes for the "Who Won the White Vote?" map. This is one I'm digging at the moment:
That map is a great idea. For the first map, it would be good to have some state outline.
I understand giving Obama all counties projected as 48% or more for consistency, though Carroll County, NH can be guaranteed white for Romney since Romney won the county 49.7%-48.9% IRL and the county is almost all-white and was projected at Obama 48%.
Edit: several counties in Iowa are in the same situation as Carroll, NH.
I would also look at Oneida and Iron Counties in Wisconsin. Obama lost both in 2012 and they are like greater than 95% white.