The people who elect a party cannot be totally absolved of blame. The people have a responsibility to inform themselves of the policies put forward by all parties during an election campaign and vote accordingly. In Australia, this is not a difficult thing to do.
An observation of the Labor campaign in 2004 reveales Labor's suggestion that should the Howard Government be re-elected, Australia would be subjected to lies and misinformation on a national government level. To backup this claim, Labor pointed out something, at least according to Labor, of a historical patten of Howard's Liberal Party- a pattern of standard misinformation and sometimes blatant lying. You can probably remember the '27 lies' that Labor used as examples, with the GST and the whole children overboard affair being the centrepieces.
What's more is that Howard and the Liberal Party did nothing to refute these Labor claims, possibly hinting at an underhanded Liberal PR policy- that of purposely making an effort to withhold or distort the truth.
Labor was quite vocal about the alleged lying of the Howard Government. Quite simply, the Labor message was 're-elect this government, and you will be lied too' as well as the Labor specific truth in government . On voting night, this message would have been ringing strong in the heads of the people. Yet despite it the people chose to elect the Howard Government once more.
As it turns out, that particular aspect of the Labor campaign in 2004, despite all of its' bombast and sweeping accusations, now appears to have some truth to it. Examples include Abbot's about-face on Medicare and the current IR reforms. Despite not mentioning these two massive issues in the re-election campaign in 2004, the Howard Government is not in total blame. The people knew this could well occur should they re-elect Howard, Labor told them so, so should some Australian be doing it tough funding health expenses or out in the cold as a result of the implementation of the IR reforms- and they voted Liberal last year- than may they live with the consequences of their decision.
If the people were prepared to knowingly invest so much power in the Howard Government, when full knowing that Howard could well turn his back on them, then the people hardly have a claim to spit the dummy now.
I doubt the Liberals will adhere to any 'mandate ethics'. Constitutionally, they don't have too. They have the will of the people.