SD,
The answer is linking tourism (Oregon's' number 1 industry.) and the sales tax.  A very supeficial/simple example:  1% sales tax for everyone and a 1% drop in the income tax for those in brackets 1 and 2 only (Constitutionally protected).  Additionally, do what other states do, charge non-residents more for access to Oregon parks/events.  That front license plate would have a real use then.