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
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.