This map started popping up after the 2004 Presidential election in the US, when George W. Bush got re-elected (with a legitimate majority this time). Democratic challenger John F. Kerry only won a handful of states, mainly on both coasts – where the electorate is more ‘liberal’ than in the more rural ‘flyover’ states in the middle. This map was to demonstrate the political divide between the Bushites on one side and rational people in the US and elsewhere.
This map can be found all over the internet. I lifted it off a blog called beancounters.