The Senate Ways and Means Committee has released its 2012 Citizen's Guide to K-12 Finance.It talks about recent court rulings related to state funding of education (and legislative responses to them), looks at how much is spent on education (by several different measures) and where the money goes, and makes some comparisons to other states.

In 2011-13, the state funds $13.6 billion (near general fund-state) for public schools; 93 percent of that was used for constitutionally-protected basic education programs. (Apparently, Washington is the only state that establishes in its constitution that K-12 education is the paramount duty of the state.)

The report also has an interesting description of the rather convoluted history of state lottery support for public schools (see pages 29-30). As the description concludes,

it is estimated that the state lottery will generate approximately $250 million in revenues this biennium. . . . Therefore, state lottery revenues, even if entirely dedicated to K-12 public schools, would represent less than two percent of the amount that the state currently spends on the operating costs of K-12 public schools.