Earlier quoted context omitted.
If you do that only for jobs in Washington state it is only a question of time until the first discrimibation law suites are filed. Plus it is easy good press.
and then the law would get struck down because, as said, washington state isn't allowed to regulate interstate commerce.
Whether they should be allowed to engage in the regulation of interstate commerce for activities that occur entirely extra-state is probably more along what you intended, but even that you could probably find allowed or as-yet-indeterminate exceptions to.