Liberal and Labor supporters are taking the fight for the marginal seat of Macarthur literally, with police called to a "scuffle involving two older men" at a pre-poll booth on Wednesday.

The adversaries were volunteers at a booth in Ingleburn, south-west of Sydney, and have apparently been giving each other grief over the past week of pre-polling.

That escalated and resulted in "grazes and bruises at the most", according to police.

The Liberals were the first to come out swinging about the incident, with Macarthur MP Russell Matheson accusing the Labor volunteer of pushing over a Liberal volunteer aged in his 70s.

"I was not at the booth when the incident occurred or at any stage today before the incident, but I do know that Labor is becoming increasingly desperate and aggressive in my local area," Mr Matheson said.

A Labor spokesperson was quick to respond, saying "a number of incidents have reportedly occurred on pre-poll booths in the Macarthur electorate".

"Labor deplores all threats and violent acts and expects all volunteers to live up to the highest standards of conduct," the spokesperson said.

Police and ambulance were called to the community centre in Ingleburn, but police said "no further action has been taken" against the men, who police say are known to each other.

It is not the first time the election campaign has become heated:

Former Liberal MP Sophie Mirabella denied she physically pushed her political opponent, independent MP Cathy McGowan, at a function in north-east Victoria

Bar staff intervened in a stand-off between Deputy Prime Minister Barnaby Joyce and an anti-mining campaigner at a New England Pub earlier this month

Election sign theft and defacement comes with campaign territory but one senator decided she had had enough

The New South Wales Nationals rejected accusations by New England Independent candidate Tony Windsor that the Party's latest campaign ad for the seat suggests he cheated on his wife