Can anyone explain exactly what is obama's specific appeal to this state and why they seem to love him so much?
Washington is a highly secular state, fairly libertarian, although it is polarized between the East and West. Western Washington is overwhelmingly Democratic, but Republican can with with the suburbs East of Seattle. However, as a resident of the Eastside (Seattle burbs), I know that Obama is just loved here. I have no clue why, but I have been caught up as well as the rest of my area in Obamamania. Heavily college-educated, affluent demographics that tend to be liberal, so Obama gets a lot of help. Washington has all the demographics that are perfect for Obama.
McCain could be good in Washington, but Obama is just better for the state. Against Clinton, we would probably vote for McCain.