It was the urban vote says Nate Silver:

...the future of America is an urban one among the twenty largest metropolitan areas in 2000, nineteen had added population by 2007, a trend likely to sustain itself as rising gas prices place more pressure on exurban commuters. Republicans trail Democrats among essentially every fast-growing demographic except the elderly the youth vote, the Latino vote; they never had the black vote. It is long past time that they hone their pitch to urban voters, and find their shining city upon a hill.

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