What does the swing against the Coalition in the Australian Senate mean?

Bumble Bee

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Austraila's recent federal election produced the closest result in Australian history, with neither major party gaining a majority in the House of Representatives and both losing ground in the Senate to the Greens.
http://en.wikipedia.org/wiki/Australian_federal_election,_2010

Why was there a swing towards the Coalition nationally in the House of Representatives, but against then nationally in the Senate?
 
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