New research suggests that increasing numbers of people want to live among those who share their politics. In this April 2010 photo, an aerial view of a Tucson, Ariz., housing development. Charles Rex Arbogast/AP hide caption

itoggle caption Charles Rex Arbogast/AP

Families generally offer homogenous groupings when it comes to politics — but there's always that outlier brother-in-law or great-aunt. ClassicStock/Corbis hide caption

itoggle caption ClassicStock/Corbis

President Bush and then-Democratic presidential nominee John Kerry shake hands at the end of a presidential debate in 2004 in St. Louis. Researchers want to better understand why partisans' views of the facts change in light of their political loyalties. Charlie Reidel/AP hide caption

itoggle caption Charlie Reidel/AP