I think "Portland" includes Astoria and the rest of that NW Oregon region which should vote Clinton.
I've had constant arguments over whom Astoria will vote for with bgwah. Obama and Clinton both have strong constituencies there. Obama has environmentalists and hippies, Clinton has working-class whites. Columbia County should be strong for Clinton.
However, defining "Portland" as Clatsop + Columbia + Yamhill + Clackamas + Washington + Multnomah, which is pretty impressive, Clatsop and Columbia are only 5% of the district. Interestingly, I've forgotten how much Columbia is becoming an exurb of Portland. That could help Obama limit his bleeding there.
By that definition, 52% of registered Democrats (as of last month) would be in the Portland metro.
I have no earthly idea how hey managed to get 69% of Democrats sampled as being in the Portland metro. That means that the SUSA definition must go all the way down to Salem.