The recent history of state legislative elections can be summarized with one word: homogeneity. In 1992, 16 states had single-party control of their state politics. In 2013, that number was 35. And, in a not unrelated note, that shift has been strongly toward Republicans. Of those 16 states in 1992 that were single-party run, 13 were Democratically controlled. By last year, Democrats controlled 12 -- and Republicans had leapt from three to controlling 23 states.