The Trans-Pacific Partnership (TPP) (see also this view of the TPP, among others) would become FEDERAL law, not STATE law, so you should start your research with your Oregon Congressional Delegation. This is not to say you shouldn’t also talk to your Oregon state representatives, who should be conversant on the subject of the TPP anyway, if only because any national trade laws will affect you locally, your business, you as consumer, and all of us (most of us) as taxpayers.
A brief tutorial:
An October 25, 2012, Law Librarian Blog post:
Here’s a bit of legal fun. The Tennessee voter ID law was under attack in that state as unconstitutional. The Tennessee Court of Appeals ruled that the law is constitutional. However, the more interesting part of the opinion concluded that a photo ID issued by the Memphis Public Library constituted a valid ID for anyone attempting to vote under the law. The State had argued against that point. The Court stated ….” [Link to full blog post.]