I based OR/WA's voting patterns on Vancouver Island+Coastal BC. (California was based more on the city of Vancouver and its suburbs). BC has some very interesting voting patterns which have been the source of very intense debate among certain Canadians on Atlas...
Many now-NDP areas in BC voted Reform out of regional concerns. Elizabeth May (only Green) was elected from a seat that elected Reform members in the 90's. The NDP's best seat in 2015 also voted Reform then.
Most of these Reform->NDP seats are rural, overwhelmingly white, coastal, anti-establishment places where environmentalism has become increasingly important over the last decade. In contrast, environmentalism hasn't become as widespread in the interior, so it has stayed conservative. The anti-establishment part is what allows them to make the switch between Reform/Conservative and NDP.
