Nature of the Sample: 938 U.S. Residents

This survey of 938 United States residents was conducted on August 3^rd through August 6^th, 2009. Residents 18 years of age and older were interviewed by telephone. Telephone numbers were selected based upon a list of telephone exchanges from throughout the nation.  The exchanges were selected to ensure that each region was represented in proportion to its population. To increase coverage, this land-line sample was supplemented by respondents reached through random dialing of cell phone numbers. The two samples were then combined. Results are statistically significant at ±3.2%. The error margin increases for cross-tabulations.