How the AP-GfK poll on Barack Obama was conducted
The Associated Press-GfK poll on Barack Obama and the state of the country was conducted by GfK Public Affairs and Corporate Communications March 31-April 4.
No more than 1 time in 20 should chance variations in the sample cause the results to vary by more than plus or minus 3.3 percentage points from the answers that would be obtained if all adults in the U.S. were polled.