Here is a thought I just put together:
Compare the map of voter fraud you have in your post with the map of Romney’s wins in the Republican primaries.
See any similarity? I have pointed out numerous times that the counties he won in the primaries were ones that Obama won in 2008 (by and large) - but only just considered that they were a practice run...
Look at MI - the pockets that were O in 08 were Rommey in primaries, then O again in the national. Should I believe that the all the voters that those counties are simply liberals, such that even (R)’s can’t vote for a conservative, or should I consider some other factor at play in those districts?
Of course, the correlations between 08 and the primaries are rough, and vary depending upon what time the primary was held. Other factors, such as Mormon population and ABO skew things a bit by the end, and certainly in the general.
But the upper midwest section of the country is interesting when looked at from that perspective.