March 2013 Australian Labor Party leadership spill
A leadership spill in the Australian Labor Party, the party of government in the Parliament of Australia, was held on 21 March 2013. Prime Minister Julia Gillard called a ballot for the Leadership and Deputy Leadership of the Labor Party for 4.30pm, following a press conference by former Labor Leader and Regional Minister Simon Crean over persistent leadership tensions.
Source: Wikipedia — March 2013 Australian Labor Party leadership spill (CC BY-SA 4.0)