Here's another Voter Registration Map series post, this time illustrating Oklahoma's rising tide of Republican registration, and the thawing of the great Democratic glacier that once covered Oklahoma.
This image starts with registration as it stood in January of 2012, and ends with the most current update (January 2016).
Democrats began 2012 with 47.15% of all registered voters in Oklahoma; they start 2016 with only 42.05%. In 2012, Republicans numbered 41.4%; now, they're 44.48%. Independents have grown from 11.45% in 2012 to 13.47% in 2016.
Five years has seen a 5.75% Democratic lead change into a 2.43% Republican advantage. That's a swing of 8.18%.