[_delirium]

It's on the high end, but I think around 80-90% Democratic for an urban core is fairly common. It's hard to get exact numbers because it depends on where lines are drawn. For example, Cook County (where Chicago is located) "only" voted 76% Obama, but it includes a number of suburban areas, and would be >80% if you pruned them.

Here are the next-most-Democratic cities I came across in some spot-checking, with NYC boroughs broken out b/c they're separate counties: 89% Bronx (NYC), 86% Manhattan (NYC), 84% San Francisco, 80% Brooklyn (NYC), 79% Boston, 79% Alameda County (East Bay), 77% Portland.

Silicon Valley is closer to the 70-ish you're thinking of, but it includes a number of quite suburban areas. Obama won 74% in San Mateo County, and 70% in San Jose County. LA County is about the same (70%), as is Fulton County (Atlanta).

[Stratoscope]

> 70% in San Jose County

Santa Clara County? :-)

> LA County

Sorry, I guess we're a bit overly fussy out here. That one would be Los Angeles County. (Not that you couldn't call it LA County, just doesn't sound quite right. It's not uncommon to abbreviate the city to LA, but not so much the county.)

[javajosh]

Not only irrelevant, but also wrong. We say "LA County" all the time.

[Stratoscope]

Ah, you and _delirium are right, sorry. That's what I get for posting late at night.

[_delirium]

Oops, you're right on Santa Clara County. LA County is fairly common though I think.