I have to say yes
Oregon itself is part of that left coast democratic was, much like the Northeast Corridor
Portland has the mayor that enabled Antifa riots, disregarding law and order
Portland is a community that has welcomed street squatters to leave feces on their streets
Portland is a sanctuary city
And I just looked it up, Portland hasn't had a Republican Mayor since 1980.
Republicans have been mayor of Portland for 2 of the last 63 years
So yes, Portland is very much a liberal democratic city. But for the most part I'm going to suggest it may be more about being liberal than being democratic. By that I mean I don't think it's the poorer urban areas that dominate the politics, although I'm certain that contributes. Places like NYC, Philadelphia, Baltimore, Detroit, Chicago and CA's urban areas carry the whole state for the democrats.
Happens elsewhere as well, in most democratic states it's all about getting out the urban vote.
The media likes to pretend it's all about the north vs the south, or the northeast and the left coast vs flyover country.
It's not really, it's mostly about urban areas vs suburbs and rural areas, even within each state. With exceptions of course, as with everything.