The Labor Party has crowdfunded thousands of dollars to run a TV ad created by the five-year-old daughter of senator Sam Dastyari, called "The Least Negative Ad Ever".
Labor is doing a last minute TV ad blitz, before the political advertising ban comes into effect at midnight on Wednesday.
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Both major parties have already splurged more than $6.5 million on TV advertising in the past eight weeks (Liberals $3,747,121, Labor $2,827,807).
Labor has emailed supporters asking for donations to make up its $13K short fall in advertising targets to get "The Least Negative Ad Ever" on TV on Wednesday.
"In the final 72 hours of this election, a quarter of voters will make up their mind. So together we can blast this contest wide open," assistant national secretary Paul Erickson urged supporters on Tuesday.
The party has raised enough to get the ad on daytime pay TV, and hopes to raise enough to get it on during more expensive prime time.
Labor is buying up TV ads at a cost of between $5,000 and $10,000 a pop, while the Liberal party is splurging thousands on cheaper FM radio ads.
Analysis from advertising monitoring firm Ebiquity has found that although the Liberal party is outspending the other parties on overall ad buy, Labor is running proportionally more negative ads.
Labor leader Bill Shorten wouldn't comment on the negative ads, instead saying he loved the TV ad created by the "two stars of this election campaign" - Hannah and Charlotte.
"Who says five years olds can't make political ads", Sam Dastyari told BuzzFeed News.