Sounds like Portland is a rather nice place to live -- a fact backed up by everybody I know who has ever lived there, despite what Cato says. This has actually puzzled me since I went to Seattle and noticed all the awesome coffee shops and bookstores and generally nice features. Why can't DC have all that. There are, after all, lots of young, computer savvy white people in Mt. Pleasant, but nary a coffee shop to serve them. It's barbaric!
But it actually makes sense: Cities like Portland and Seattle are trying to create a livable city to retain and attract a certain type of resident. Namely, educated, young, white people. Portland's 78% white, Seattle's a bit under 70%. So you structure the city thus that there's lots of educated white people bait, including cafes, bookstores, wireless internet spots, bike trails, etc.
DC, by contrast, has a lot of white people working in it, but is actually only 39% white, and has a city government that does not derive primary political support from transient white voters. So the character of the city actually does more to represent its inhabitants. Which seems rational. Moreover, the white people there basically have to be there. You don't move to DC because it's awesome, you move because it's where your work is. So there's little need to construct an affirmative agenda to attract residents.
Read the comments: As they make a fairly good case that this post is wildly off-base.
See update. Sometimes things come out wrong.