Malcolm Turnbull is breathing political fire about the Emma Husar affair. But one thing he hasn't done so far is say there should be a byelection in the Labor MP's ultra-marginal New South Wales seat of Lindsay.

Of course the Government couldn't force a by-election even if it wanted one, but after the fallout from its failure to wrest a couple of potentially vulnerable seats from Labor on Super Saturday, it has had its fill of such contests for now.

A by-election is the last thing the NSW Liberal party would welcome, on top of the state one it has in Wagga Wagga, after its MP resigned in a corruption scandal, and an expensive state election early next year.

If any Liberal call does come for Ms Husar to quit parliament immediately — rather than at the election, as she's announced — rest assured it would be made on the comfortable expectation that she wouldn't do so.

The bad publicity around Ms Husar, accused of bullying and misusing her staff and much else (all of which she denies) and the associated Labor party infighting, should help the Liberals in Lindsay, other things being equal. But that's for later, at the general election.

Shorten may be 'resorting to literalism'

Meanwhile Turnbull is weaving the extraordinary saga of this first term MP into the government's familiar narrative about Bill Shorten. That the Opposition Leader doesn't tell the truth. And that his workers-friend credentials are phoney.

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Mr Shorten repeated on Thursday: "I had no knowledge of these complaints. I've gone back and asked my staff, they had no knowledge of the complaints or the process until we heard it leaked to the media."

But the Government declares he must have been aware much earlier — on the grounds that everyone else seems to have known.

Mr Turnbull said on Thursday that Mr Shorten "needs to tell us what he knew and when". As well, Mr Shorten "claims to have been a great champion of the workers … So where was the champion of the workers when people were being allegedly mistreated?"

This week one former Husar staffer alleged that complainants had been talking to Mr Shorten's office for months. Mr Shorten responded that a check had been made and "none of my staff have confirmed that."

Undoubtedly, there'd been plenty of long-running rumours about Ms Husar and her office, which had a huge staff turnover. Labor frontbencher Anthony Albanese said again on Thursday he'd heard rumours about issues with staff "for a while. There were various rumours around the building".

Whether Mr Shorten has closed ears — an opposition leader does have a lot on his mind — or is splitting hairs, we simply can't be sure. Some in Labor believe he is resorting to literalism.

Mr Albanese said pointedly, "what I think has been said there is a matter of when he was formally notified."

Then deputy prime minister Barnaby Joyce and Prime Minister Malcolm Turnbull sit on the front bench during Question Time last year. ( ABC News: Nick Haggarty )

Parallels with Turnbull and the Joyce baby rumour

On the subject of "what he knew and when" and rumours, consider some parallels with Malcolm Turnbull and the Barnaby Joyce baby rumour.

In his book Weatherboard and Iron, released this week, Joyce writes that throughout the campaign for last year's December 2 byelection in his New England seat, there was "the threat that my private life would become a public debate … I believe many knew or had at least heard the rumour that Vikki was pregnant".

An exuberant Mr Turnbull celebrated with Mr Joyce on by-election night, hailing "getting the band back together". But after the scandal burst into the media in the new year, he publicly excoriated Mr Joyce, deploring ministers having sexual relationships with staff and announcing the so-called bonking ban.

The obvious question was, when had Mr Turnbull first known about Joyce's relationship? On that happy December night, was he aware of the rumours that Mr Joyce says many had already heard?

Mr Turnbull told 3AW in February, shortly before Joyce quit as Nationals leader and deputy prime minister: "Barnaby at no time said to me that he was in a sexual relationship with this woman." He said he could not recall when he first heard a rumour — "but probably … about the same time, possibly later than others." As for asking Mr Joyce, he would not be drawn on private discussions.

Voters assume politicians are lying all the time

Whether the Government can make political mileage with its claim that Mr Shorten knew about Ms Husar's behaviour earlier than he admits is yet to be seen. While voters don't have a high opinion of Mr Shorten, they also have such low regard for politicians generally that they are more likely than not to assume many of them are lying much of the time.

Labor needed Ms Husar to fall on her sword before Parliament resumes next week. She did so ahead of the release of the findings of the NSW Labor-commissioned inquiry into her behaviour, expected imminently.

There was no way she was going to be retained as the candidate, but the timing limits the damage. Still, within Labor there is some nervousness about what other fallout there might be, and this goes beyond the Government's attacks.

Having an angry and distressed Ms Husar within Labor ranks will be difficult. And will the disgruntled former staffers be satisfied that the matter has been handled adequately? The Government is encouraging them to take their complaints further, as well as calling on Mr Shorten to refer the material for independent scrutiny.

As always happens with scandals, they've been calls for changes to the system — in this case, more rules around treatment of staff.

Is this really necessary? MPs' offices are hot houses of pressure and tension, and staff often have testing bosses, very challenging jobs and punishing hours. But bad circumstances in one office don't necessarily mean the whole system needs overall. Anyway, the fall of Ms Husar will send a powerful message to other MPs on being careful about how their offices run.

Unfortunately, however, the sorry tale has also sent another message. That one is to the voters about their politicians — and, as so often, it's a negative one.

Michelle Grattan is a professorial fellow at the University of Canberra and chief political correspondent at The Conversation, where this article first appeared.