Are approval ratings only the voice of voters?

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Is the approval rating of Bush just based on questions asked of registered voters, or a sample of everyone?

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Here’s a report on the quarterly average of the most recent Gallup approval rating polls.

New Low in Bush Quarterly Average Approval Rating

Survey Methods

Results are based on averages of eight Gallup Polls, each consisting of telephone interviews with approximately 1,000 national adults, aged 18 and older, conducted between Jan. 20 and April 19, 2008. For each poll, one can say with 95% confidence that the maximum margin of sampling error is ±3 percentage points.

Interviews are conducted with respondents on land-line telephones (for respondents with a land-line telephone) and cellular phones (for respondents who are cell-phone only).

Other polls may differ, but this one isn’t restricted to voters, only owners of telephones.