Labor Party power-brokers, such as Graham Richardson and Barrie Unsworth, now openly switched their allegiance from Hayden to Hawke. More significantly, Hayden's staunch friend and political ally, Labor's Senate Leader John Button, had become convinced that Hawke's chances of victory at an election were greater than Hayden's. Initially, Hayden believed that he could remain in his job, but Button's defection proved to be the final straw in convincing Hayden that he would have to resign as Labor Leader. Less than two months after the Flinders by-election result, Hayden announced his resignation as Leader of the Labor Party on 3 February 1983. Hawke was subsequently elected as Leader unopposed, and became Leader of the Opposition in the process. Having learned that morning about the possible leadership change, on the same that Hawke assumed the leadership of the Labor Party, Malcolm Fraser called a snap election for 5 March 1983, unsuccessfully attempting to prevent Labor from making the leadership change. However, he was unable to have the Governor-General confirm the election before Labor announced the change.