Port Adelaide state by-election, 2012

A by-election occurred in the South Australian House of Assembly seat of Port Adelaide on 11 February 2012. Labor's Susan Close won the seat on a 52.9 percent two-candidate-preferred (TCP) vote. The by-election was triggered by the resignation of former Deputy Premier, Treasurer and state Labor MHA Kevin Foley.

Foley and Mike Rann resigned from their parliamentary seats, which created twin by-elections for 11 February, the other being the 2012 Ramsay by-election. On two-party-preferred vote (TPP) margins of 12.8 and 18.0 points from the 2010 election, considered safe margins on the current pendulum, Labor would have likely retained both seats on the TPP vote based on unchanged statewide Newspoll since the previous election. In the lower house, 24 seats form a majority, the Labor government held 26 of 47 seats. If one or both seats had been lost, Labor would still have retained majority government.

Foley was first elected as the member for the new north-western metropolitan seat of Hart at the 1993 election, moving to the recreated seat of Port Adelaide at the 2002 election after Hart was abolished in an electoral redistribution. From Rann Labor's election to government in 2002 until 2011, Foley became the longest-serving Deputy Premier of South Australia and the third-longest-serving Treasurer of South Australia.

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