Labor is certain to win two of Super Saturday's five by-elections - Perth and Fremantle - as the focus and fight remains on three seats in the east - Longman, Braddon and Mayo.
The Liberal party decided against contesting Perth and Fremantle, leaving it clear for the Labor candidates to almost certainly win but raising concerns of a poor voter turnout.
Fremantle Labor candidate Josh Wilson, who forced the by-election when he had to quit over dual citizenship issues - hopes to improve the 41 per cent primary vote he secured at the last federal election.
"I certainly had people who identified as Liberal voters saying that they weren't sure what to do," he said on Saturday.
"I sympathised with them, I pointed out the fact that I've been a very hard working local member in the past, that I've grown up in this community, that I haven't got horns, that maybe they need to make an exception and it will be our secret."
The lack of a Liberal candidate and expectations that Labor would win had resulted in initial slow pre-polling, leading to expectations of a rock-bottom turnout.
Mr Wilson, the port city's former deputy mayor who held the seat previously with a 7.5 per cent margin, said the number of voters at a local primary school polling place looked "reasonable" for early on a chilly Saturday morning.
"The pre-poll numbers got stronger as the end of this week came about," he told reporters.
"In Fremantle in 2016, there was about 8500 pre-polled. My sense is we were around 7500 on Friday, so it's not as low as some people were saying."
Fremantle was once won by the Greens, in 2009, and the party is expected to get another strong result amid renewed anti-live export sentiment.
Mr Wilson strongly supports Labor's stance of phasing out the trade.
Labor is expected to also easily win the seat of Perth, which the Liberals also are not contesting, despite the slimmer margin of 3.3 per cent.
Candidate Patrick Gorman is a former Kevin Rudd staffer and state secretary, and masterminded Labor's 2017 WA election campaign, which delivered a thumping victory.
