Despite his victory in the June spill, Hawke quickly began to be regarded by many of his colleagues as a "wounded" leader; he had now lost his long-term political partner, his rating in opinion polls were beginning to fall significantly, and after nearly nine years as Prime Minister, there was speculation that it would soon be time for a new leader. Hawke's leadership was ultimately irrevocably damaged at the end of 1991; after Liberal Leader John Hewson released 'Fightback!', a detailed proposal for sweeping economic change, including the introduction of a goods and services tax, Hawke was forced to sack Kerin as Treasurer after the latter made a public gaffe attempting to attack the policy. Keating duly challenged for the leadership a second time on 19 December, arguing that he would better placed to defeat Hewson; this time, Keating succeeded, narrowly defeating Hawke by 56 votes to 51.