The Labor and Liberal parties are yet to decide if they will formally argue against the AEC in court.

But the Liberal Party's state director Ben Morton recently spoke against a re-run, saying it would cost taxpayers more than $11 million, only to produce a less democratic result.

"We know that voter turnout is always diminished in by-elections so if a by-election is run we know that less people will have a say in who they are in this state," he said.

Some Liberals are also worried about a drop in the party's vote after six months of an Abbott government, and the possibility they might not win three out of the six Senate seats, a second time around.

Meanwhile some in Labor are worried about the cost of fighting another campaign and being outspent by Clive Palmer's United Party.

A fresh election would also bring unwanted attention to Labor's decision to put union official Joe Bullock ahead of Louise Pratt on its Senate ticket, something that still has members at loggerheads.

In a bid to head off further infighting, Labor's national executive has intervened to stop the order of the party's senate ticket being changed, if there is to be another election.

