And if you have Minnesota as blue on the basis of the growth of the heavily GOP exurbs, the collapse of the housing bubble has basically killed that area, the growth has heavily dropped, and some of the newly built subdivisions have become basically ghost towns (interesting article on this in the StarTrib about a week ago.) Meanwhile Minneapolis has started gaining population again. The "trend" in the state that Republicans worshiped from 2000-2006 and have now mostly shut up about is for certain dead assuming it ever existed in the first place.
I'm assuming he is using red for the GOP and blue for the Dems, which *is* confusing on this site.
Personally, I think any prediction for 2040 is nonsense. For one thing, what are the parties going to look like? What will the economy look like? Will immigration continue at the current levels? Will one party "lock up" Hispanic voters, or will they be a swing constituency? There's really just no basis for predicting that far ahead.