Many states have language in their constitutions that requires the state to provide for an adequate level of education spending. What is the economic rationale for such a requirement?

Many states have education spending language in their constitutions to maintain an appropriate level of spending in relation to the number of students in each state and to ensure that there is funding available as needed. The economic rationale is that as states have financial difficulties, the government leaders may be tempted to use funds that have been set aside for educational areas for other special interests.