The balance of power in our Senate is held by independents and the Greens, but mostly by an ultra consertvative called Senator Fielding who represents the christian orthodoxy. To pass legislation the government must get the Greens and Fielding on side to out vote the opposition Liberal Party who are not liberals but conservatives.
Thus the government is always having to suck up to Fielding.
After the next election, later this year, it is unlikely that Fielding will have that power any more, even if he is re-elected. The current polls would have the Greens with enough senate seats to control the balance of power in the upper house irrespective of which major party wins the general election. When they have to suck up to the Greens, rather than the Christian right wing it will be very interesting to see how policy changes, even if we have a conservative government (still not likely, but you never know).