Fact checking Reykdal's claims is like diving into a swamp of quicksand, headfirst. The pain starts with the Herald's reference to Reykdal's report without providing a link. Eureka, I finally found it! (https://tinyurl.com/y7ezygbs). His numbers come from a Rutgers report that's dated 2013 but uses 2009 per capita GDP spending numbers and presumably 2009 % of education spending (https://tinyurl.com/y9jyb8sj) 

So here's what I came up with.The latest number for Wa. State GDP is $476.5 billion dollars (https://tinyurl.com/ybgazrxd)...you need to scroll down to find the number. The .6% difference between where we supposedly are now (very much in doubt) and where we "need to be" (his opinion) is $2.9 billion, not $4 billion.  In other words, the gap appears to be about 25% less than what the Editorial board uses to justify "new sources of revenue".  Given what I've cited,I would love the board to reply and explain how their editorial helps taxpayers understand this very complex situation.