Ok, the fact that everyone assumes that the northern states would join Canada just bugs me. Sorry Canadians, you are great, but any state in the USA would be far too individualistic and proud to go join another country if they hypothetically broke off of this one.

I definitely believe that BC would join with Washington, as we feed so much off of each other by the border.

However, the 'liberalness' of that new nation would be up for debate, seeing how only the heavily urban areas of the PNW (Mainly Seattle, Tacoma, Portland, & (I think) Vancouver) are dominated by liberal, and for the currently-US cities, they still hold a fairly large amount of conservatives. All of the rural areas - which there is a lot of - would be conservative and would fight against the liberals. If it didn't become a split nation (like current US) or a moderate nation, I would have to say that it would split up further.

PNW politics is complicated.