Ever since the 1930s, most urban areas have leaned Democratic. But in presidential elections, many remained stubbornly competitive between the two parties. As late as 1988, for example, Republican nominees won Dallas County and made strong showings in the core urban counties of Cook (Chicago), Los Angeles and King (Seattle).
Today, America’s urban areas have evolved into a political monoculture that increasingly resembles the “solid South” that provided a base for Democrats from the late 19th century to the 1960s. Since 1972, the year of the Nixon landslide, the Democratic share has grown 20 percent or more in most of the largest urban counties.
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As a result, places where Republicans such as Ronald Reagan could once win a respectable share of the vote — including San Francisco, Philadelphia and New York City — by 2004 were delivering 80 percent or more to the Democrats. Even in the losing year of 2004, Democratic nominee John F. Kerry won almost every city of more than 500,000 people.
This fall, Barack Obama, a resident of Chicago, can comfortably expect to triumph in virtually every major urban county, often by ratios of 2-to-1 or more. He can count just as much on cities in decline as he can on those that have been gentrified; he will rack up big margins both in heavily white core counties such as those around Minneapolis and Portland, Ore., as well as overwhelmingly minority Baltimore, Philadelphia and the Bronx, N.Y.
Race and income levels do not explain the emerging urban monoculture, because the cause lies elsewhere: in the evolution of cities over the past four decades. The shift began in the late 1960s, when urban regions, from financial centers such as New York and Chicago to old industrial cities such as Detroit and Cleveland, began to suffer a massive exodus of predominantly white, middle-class residents.
This left behind an increasingly impoverished, highly minority population with very little proclivity to support conservative or even moderate Republicans. Today in some cities — mostly old industrial centers in the East and Midwest — this population remains dominant and is likely to vote in huge numbers for Obama. Most of these cities suffer poverty rates at least 50 percent higher than the national average.
At the same time, some other cities — such as New York, Chicago, Boston, San Francisco, Seattle and Portland — have done far better. They have done so by attracting a population of well-educated, white professionals. Pockets of this demographic, to be sure, also exist in some hard-hit industrial cities, but the new urban affluents tend to concentrate in cities with industries, such as financial services and media, that provide excitement and the prospect of high-wage employment in a glamorous setting.
Many new urbanites tend to be students or professionals enjoying city life during their first, highly experimental years of adulthood. At this point, they are most open to liberal ideas and causes; they have yet to worry much about taxes and crime, issues that drive people to the center. As they grow older, marry and raise families, many in this cohort — particularly those who do not ascend into the upper classes — leave the urban core for the suburbs or other more affordable regions.