Historical rankings of Prime Ministers of Australia teaching or researching in the fields of Australian politics or history" to place Australia's prime ministers in five categories; 40 responded. Five points were awarded to prime ministers judged "outstanding", four for those considered "good", three for "average", two for "below average", and one for "failure". The three caretaker prime ministers were excluded from consideration, as was the serving prime minister, Julia Gillard. John Curtin received the highest average rating, 4.78, and he was the only prime minister who no respondents gave a rating lower than "good". It is possible to compare the highest approval ratings achieved by Prime Ministers
Julia Gillard conclusion of a criminal investigation. After a week of controversy, Gillard announced that she was asking Slipper to delay his return to the Chair pending the conclusion of concurrent civil proceedings, in an effort to dispel what she described as a "dark cloud" over her government (a reference also to the ongoing Craig Thomson affair involving a Labor MP linked to corruption allegations). In the light of poor polling results for the Gillard Government, speculation that Foreign Minister and former Prime Minister Kevin Rudd wished to challenge Gillard for the leadership culminated with Rudd resigning from the Cabinet on 22