The Australian:

The main lobby group promoting gay marriage yesterday distanced itself from polyamorists demanding to be included in the proposed reforms, saying marriage involving more than two people would undermine a traditional institution.

As reported yesterday by The Australian, Greens senator Sarah Hanson-Young has come under attack from polyamorists, including some who are members of her party, for insisting that marriage should be between two people of any sex, but no more than two.