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In the tight one-seat majority government, Victoria's Julia Banks holds Chisholm by 2,154 votes, while New South Wales' Ann Sudmalis and Lucy Wicks sit on margins of 1,503 and 2,179.

The Liberal MP on the smallest electoral margin is Bert Van Manen, who holds the Brisbane seat of Forde on just 1,062 votes.

"Van Manen, Sudmalis, Wicks, they only need a few hundred of those new voters to bring them down," the MP told BuzzFeed News.

Against the backdrop of this influx of new enrolments, the High Court will hear two legal challenges, on September 5 and 6, about whether the same-sex marriage survey should even be held at all.

Even if the High Court challenge succeeds and the survey is subsequently scrapped, the new voters who've already registered will remain on the electoral roll for future elections.

One senior Liberal source said there was a discussion going on behind closed doors about whether the party should even be committing any resources to encourage voters to participate.

"We are seeing young Liberal people out there, getting out enrolling people to vote," the source said. "It could be a bad idea for next year."

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Liberals Are Privately Shitting Themselves Because The Marriage Survey Could Seriously Backfire - BuzzFeed News