Rivrgy, I haven't read the initiative, so I don't know if this is coverec or not, but let me say this.....State income tax has been approved before, but was thrown out due to what is known as, "the uniformity clause" in Washington State's constitution.
I don't know if this intiative addresses that issue, but if it doesn't, I doubt it will fly......approved by the voters or not.
I'm pretty sure that a Constitutional amendment is required.....which should be interesting considering Eyeman's intiative requiring a 2/3 majority to increase taxes........