OR-4 is almost exactly the kind of place Democrats should be doing great in. The white, upscale, educated places that have been holding steading or improving from 2020.
OR-4 also contains a lot of downscale WWC areas along the coast as a counterbalance.
That's a very small portion of the district though. Lincoln county only has 50k people, the southern coastal part of OR-4 is heavily R anyway.
Republicans have a strong base in the district in the south, but it shouldn't be enough to overcome the solid D parts in Eugene and Corvallis.