Once the count was on and I started to see a few more votes in that pile for the liberal democrats, I knew it was going to take a sizable proportion off the mainstream party in error. Having a look at statistics though, where I was working and surrounding regions had informal vote rates of 12% to 15% (much higher than the national average). It's also a labor party stronghold, which is the party who just got knocked out.
It's also worth pointing out that the particular ballot paper was enormous, over 1m long, 110 candidates for 6 positions, 35 parties and can be very confusing to explain to people who barely speak english, on how to make their vote formal, let alone read the 6.5 point print on who they're voting for.
Moral of the story is, you can't help stupid people, but you can let them to vote... (NB: Australia has compulsory attendance to vote and compulsory preferential voting in federal elections)