Tribal loyalties run deep - my mother cannot even conceive of the possibility of voting Liberal, whereas I have often done so! (Non-Australians please note: in Australian political terms, to a first approximation "Liberal" doesn't mean liberal, but conservative. I am no liberal, but I am a conservative.) Ideology aside, given the maladministration evident in both the State and Commonwealth Labor governments, to vote the opposite way just to register a protest vote would seem reasonable.
Mum has (I say this in charity) an unreasoning dislike of the Federal Opposition Leader in particular. Is this a gender issue, whereby men prefer Tony, and women prefer Julia? Jokes aside, after an exchange about Abbott, she has bet me $100 that he ("that dreadful man") will never be Prime Minister – to which I replied, "I will collect the money on election day" (though technically he will need to be sworn in first, of course).
Kate, would you care to participate in this little wager?