The Atlantic/Aspen Institute American Values Poll, conducted by Penn Schoen Berland with sister firm Burson-Marsteller, examines social, cultural, and political divisions in America. Here is an executive summary of the full results. See also Don Baer and Mark Penn's analysis, Bob Cohn's story in charts, and the full 114-slide results (PDF).
American Values Survey, 2013
The Atlantic and the Aspen Institute polled 2,000 people on the degree to which the nation is united or divided.