I am sure there are better legal experts out there who can analyze the feasibility of this and put it together in a more sophisticated way, but here is the idea I had.
Somehow take a claim to the state court system along these lines:
Way back in 1850's, when the state of Oregon was formed, there was an entity known as the "United States". The state's sovereignty is subject to that entity. The state constitution does not define what it is, but often refers somewhat loosely to the "United States", "United States Government", and the "Federal Government". However, it is well understood that that entity known as the United States Government for which the State of Oregon defers much of its sovereignty to has the following properties: (1)- it's operation is fundamentally constrained by the United States Constitution, and (2)- secondarily, it's operation is constrained by the rule of law derived by its procedures which also are fundamentally constrained by the United States Constitution.
Today, it is clear that the entity currently known as the United States Government and for which the State of Oregon's sovereignty is still limited by, is in contempt of the United States Constitution as well as the rule of law derived from its political system. It shouldn't be too hard to present a list of examples for which the President, his administration, Congress, etc. apply here.
Therefore, that entity currently known as the United States Government cannot be considered the same entity known as the United States Government which ratified the State of Oregon in 1859. That original entity appears to no longer be operational.
Therefore, unless that original entity can be found operating somewhere, the State of Oregon must be declared a nation that is currently under occupation by an illegal regime.
Any attorneys or other legal experts out there who who think something like this shows some promise and would like to take on stuff like this?