It seems like Democratic states are more likely to vote in a periodic Republican than Republican states are willing to vote in a periodic Democrat.
That is fascinating. It's probably the first time in US history that that has been true. Bush having a such good midterm in 2002 might be skewing this a bit, but overall D+10 states seem much more comfortable with R governors than vice versa.
Among close states, MN, VA and NC stick out as potentially having something special going on (in the case of NC, for R's).