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In page Candidates of the 2013 Australian federal election:

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Six Senate places were up for election. The Labor Party was defending two seats. The Liberal Party was defending two seats. The Greens were defending one seat. Independent Senator Nick Xenophon was defending one seat. Senators Sean Edwards (Liberal), David Fawcett (Liberal), Alex Gallacher (Labor), Anne McEwen (Labor), Anne Ruston (Liberal) and Penny Wright (Greens) were not up for re-election.