Coalition leader Tony Abbott roped in two of his daughters to record an election message for the Big Brother housemates, while Prime Minister Kevin Rudd just dropped off a generic campaign DVD.

The Nine Network invited Mr Abbott, Mr Rudd, Greens leader Christine Milne and Clive Palmer, from the Palmer United Party, to make tailor-made campaign messages for the housemates.

Of the political quartet, only the prime minister did not personalise his message to the Big Brother roomies, who have yet to be told the general election is being held on Saturday.

The housemates will be told on Wednesday about the election date and then shown a three-minute DVD from each leader about why they should vote for their respective parties.

Big Brother's executive producer, Alex Mavroidakis, said on Monday he was just grateful the politicians had obliged with DVDs.

Abbott daughters Bridget and Frances say they watch the reality show, he added.

"Of the four videos we received, the only one that is not personalised is Rudd's," Mavroidakis told AAP.

"We offered everyone a chance but I think Rudd had several pre-made generic messages and he sent one of those.

"We've got a great one from Christine Milne, Clive Palmer and Tony Abbott also saying 'Hello housemates', and Abbott's there with his daughters saying they watch the show."

Mavroidakis said the production staff worked closely with the Australian Electoral Commission and the housemates' families to ensure the voting process was correct.

This is the first time in the world a Big Brother franchise has had to deal with an election, he said.

"We will endeavour to show the same amount of time on each message, so we won't be showing more of Rudd and less of Abbott or vice versa," he said.

"We'll play it with a straight bat and we won't be telling them to tell us who they voted for.

"If they feel they want to discuss with each other we will put it to air."

The housemates will, one at a time, cast their postal votes in the diary room.