If you were going to blame one group for Oklahoma teachers not receiving a pay raise in over a decade, the best and most obvious choice would be the Oklahoma Republican Party.
Since 2012, the Oklahoma GOP has controlled the executive branch with Mary Fallin, and held a supermajority in both the Oklahoma House and Senate. They currently hold 73% of all seats in the Oklahoma House, 84% of the seats in the Senate and 92% of bullets! Basically, they can do just about whatever they want, and for the most part, they have.