Change of party leader (Iemma): Beginning of Rees's period in office; The unpopularity of the government and severe factional tensions within the Australian Labor Party organization and the parliamentary caucus led to the forced resignation of Iemma as Premier. When attempting to recast his cabinet on Friday 5 September 2008, '... Iemma's own Right faction colleagues would not support the changes. Rather than testing the numbers in a formal vote, an emotional Morris Iemma resigned his premiership that afternoon ...', Lloyd Cox, 'New South Wales State Politics', Australian Journal of Politics and History, Political Chronicles, July to December 2008, 55(2) June 2008: 269-274, at p. 271. Caucus then selected Rees as leader, and he was commissioned as Premier of an Australian Labor Party majority government.
Change of party leader (Rees): Dissatisfaction within the Labor Party over the leadership of Premier Rees grew during 2009 as the government suffered a series of embarrassments and declining support in the opinion polls. 'On 3 December, the right faction met to settle on their challenger to Rees. Kristina Keneally, the forty-year-old, American-born Planning Minster who had only been in cabinet since April 2007, was chosen. ... The full caucus meeting that followed saw Keneally defeat Rees by a vote of 47-21', Lloyd Cox, 'New South Wales State Politics', Australian Journal of Politics and History, Political Chronicles, July to December 2008, 56(2) June 2010: 283-288 at p. 287. Keneally was then commissioned as Premier of an Australian Labor Party majority government.
References: For an extended study of the details and context of the selection and removal of Rees as Premier, see Rodney Cavalier, Power Crisis: The Self-Destruction of a State Labor Party, (Melbourne: Cambridge University Press, 2010, ISBN 9780521138321); an extended review of the Australian Labor Party's period in government is provided in David Clune and Rodney Smith (editors), From Carr to Keneally: Labor in Office in NSW 1995-2011, (Sydney: Allen & Unwin, 2012, ISBN 9781742376639).