In the United States, presidential job approval ratings were first conducted by George Gallup (estimated to be 1937) to gauge public support for the president of the United States during their term.
Many unscientific approval rating systems exist that show inaccurate statistics.
Examples that self select, such as online questions, are of this type; however, the aggregate approval rating is generally accepted by statisticians as a statistically valid indicator of the comparative changes in the popular U.S. mood regarding a president.
George W. Bush registered a 90% job approval rating (the highest in Gallup's tracking) shortly after the terrorist attacks on September 11, 2001.
[2] Harry S. Truman registered a 22% job approval rating (the lowest in Gallup's tracking) in a survey conducted February 9–14, 1952.