Labor is relaxed about billionaire Clive Palmer outspending major parties on the West Australian Senate election campaign.
Prime Minister Tony Abbott says Mr Palmer is trying to buy seats in parliament in a bid to further his own interests.
If the Palmer United Party (PUP) can win a WA Senate seat this Saturday in the election re-run it will have three members on the upper house crossbench after July 1.
It has been estimated by monitoring agency Ebiquity that PUP spent 11 times more on advertising than Labor and 14 times more than the Liberals in March.
Labor deputy leader Tanya Plibersek, campaigning in Perth on Wednesday, said it was up to each party to determine how much was spent on a campaign.
“We believe in a democracy,” Ms Plibersek said.
“As long as a political party declares all its donations, as long as it abides by the rules, they’ve got every right to spend the money they raise.”
Mr Palmer said he had only spent a third of what the Liberal Party did at the 2013 federal election.
“No matter how much money you spend on advertising, if you have a bad idea people won’t vote for you,” Mr Palmer told Network Ten.
Australian Greens senator Lee Rhiannon said Mr Abbott’s criticism of PUP was hollow given the Liberals had consistently blocked attempts to cap election spending and stop corporate political donations.
“In the two years prior to the 2013 federal election the federal branches of the Liberal and National parties received at least $17 million in donations, with the bulk of it from the big end of town,” she said.