That's an over simplification, and not really accurate. Oregon is a microcosm of the United States. Here is the electoral vote by county map, from 2012:
As you can see in Oregon the liberal infestation is contained to a very few counties in the western third of the state. They are the ones containing the cities of Portland, Eugene (U.of O.) and Salem (state capital). And a few counties on the coast full or retirees from those cities.
The vast majority of the State is Red. Exactly the same pattern prevails in Washington, and extends down into Northern California.
It's the damn urbanites, hives full of libtard parasites.
Just like the USA is mostly Red (geographically) but the large red areas are overwhelmed by the dense blue ones, so too is Oregon.
This is one reason that secession is now so hard, it can't be easily done on a State level anymore.
One of the nefarious aspects of Obama's disastrous administration is that his refugee resettlement, aggressive Section 8 housing policy and HUD directives are all being used to dilute red areas and infest them with alien welfare parasites.