Percentages reported in the text and tables are weighted, while the number of cases shown in the tables for various subgroups is the actual number of respondents. Questions answered by the sample of 637 likely fall voters are subject to a sampling error of plus or minus approximately 5 percentage points at the 95 percent level of confidence. For the 255 self-described likely primary voters the sampling error would be plus or minus approximately 7 percentage points at the 95 percent level of confidence. This means that in 95 out of 100 samples like the one used here, the results obtained should be no more than 5 or 7 percentage points, respectively, above or below the figure that would be obtained by interviewing all likely voters with telephones. Where the answers of subgroups are reported, the sampling error would be higher.
Surveys are also subject to errors from sources other than sampling.
While every effort is made to identify such errors, they are often difficult or impossible to measure. Readers making use of the results are urged to be mindful of the limitations inherent in survey research. Some people are registered to vote and others are not. The Republican party in Virginia will hold a primary election on June 11 to select its nominee for the U.S. Senate race this fall. One of the candidates is Jim Miller.