Interestingly, Oregon's physical location mirrors its stance towards all things related to gambling. Beaver State lies in between California and Washington, and when it comes to wagering, it's also somewhere in the middle: between completely allowed and partially prohibited.
OR allows lottery, dog and horse racing, and off-track wagering on these events). Moreover, social gaming, charitable gambling (Montecarlo nights and such), and Indian casinos are all perfectly legal.
On the other hand, things are not as transparent when it comes to online casinos.