It's quite likely that after the next federal elections the Senate will have representatives of a new minor party, the Australian Sex Party, but with every likelihood that the impact on government policy won't be minor.

Minor parties have been characteristic of  Australian politics for  more than 50 years, ever since Bob Santamaria's endeavors to take control of the ALP were thwarted by the ALP leader, Doc Evatt.  The split resulted in the Democratic Labour Party, which represented a Catholic view point and lasted 20 years.

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Source: http://www.canberratimes.com.au/