11/26/2012 01:21 pm ET

What Republicans Are Really Up Against: Population Density

Numerous theories have been offered recently not just for Mitt Romney's stunning defeat by Barack Obama, but for the apparent decline of the Republican electoral coalition. Many emphasize the diverse demographic coalition — of women, ethnic minorities, and gays — that came together behind the president, while others stress the well-executed ground game and state-of-the-art analytic techniques used by the Obama campaign.

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