Results for this survey are based on telephone interviews conducted under the direction of Princeton Survey Research Associates International among a nationwide sample of 1,506 adults, 18 years of age or older, from August 9-13, 2006. The results here are based on a random half of survey respondents on Form 2 of the survey (N=775) the sampling error for percentages is plus or minus 4 percentage points.

In addition to sampling error, one should bear in mind that question wording and practical difficulties in conducting surveys can introduce error or bias into the findings of opinion polls.