This Washington Post-ABC News poll was conducted by telephone June 12-15, 2008, among a random national sample of 1,125 adults, including additional interviews with randomly selected African Americans, for a total of 201 black respondents. The additional interviews (commonly referred to as an "oversample") were completed to ensure there were enough African American respondents for separate analysis; the group was not over-represented in the reported results from the full sample. The results from the full survey have a margin of sampling error of plus or minus three percentage points. Sampling, data collection and tabulation by TNS of Horsham, Pa.