Portland and a couple of the ‘Hip’ cities and towns essentially drag most of the state with them.

It’s a regular phenomenon in modern day. Smaller Suburban communities and the rural areas. Generally trend Fiscally Conservative/Right Wing at least in modern day. Though being socially conservative as well is far from being unusual.

Major urban centers and a handful of surrounding communities. Not to mention College Towns. Generally trend left-wing. Both fiscally and socially.

And it’s not limited to the U.S either. It’s a phenomenon that you can see overseas as well.