Prime Minister Malcolm Turnbull's one-seat majority in the lower house hangs in the balance as voters head to the polls in the Bennelong by-election.
The final week of the campaign has been filled with stunts and dirty tricks from both sides as polls for the critical election indicate the major parties are neck and neck.
Both candidates have been joined by a star-studded entourage from federal and state politics during the month-long campaign.
The ALP has sought to redefine the poll as a referendum on Mr Turnbull's leadership, while the Liberals have continually reminded voters of Kristina Keneally's past life as the premier who in 2011 led Labor to the biggest election defeat in NSW history.
A loss in Bennelong on Saturday would leave the government with 75 seats, meaning Mr Turnbull would no longer have a one-seat majority in the House of Representatives.
A Galaxy poll, published in The Daily Telegraph on Friday night, forecast a close result, putting Mr Alexander's primary vote at 40 per cent, two percentage points ahead of the former NSW premier, Ms Keneally.
