One Nation would win almost 11 per cent of the primary vote across WA if an election were held today, according to the latest poll commissioned for The Weekend West.

The results of the Reach-TEL poll, conducted on Thursday night, mean Pauline Hanson’s resurgent party is on track to hold the balance of power in State Parliament’s Upper House.

But a double-digit share of the vote — not seen in WA since 2001 when One Nation claimed three Upper House seats — could also deliver a surprise win in at least one Lower House seat on March 11, if One Nation’s primary vote continues to climb during the election campaign.

The support for the Hanson party will concern the Nationals and comes at a cost to the primary vote for the Labor and Liberal parties, despite the chaos created by the removal of former One Nation WA senator Rod Culleton this week.

Since a ReachTEL poll in September, the Liberal vote has tumbled by 5 percentage points — down from 38.2 per cent to 33 per cent today. Labor has fallen from 36.5 in September to 32 per cent now.

But Labor remains ahead on a two-party preferred basis, with 52 per cent of the vote to the Liberals’ 48 per cent. Labor leader Mark McGowan continues his lead as better premier, ahead of Premier Colin Barnett, 55.7 per cent to 44.3 per cent. In another poll revelation, Police Minister Liza Harvey has soared ahead of Mr Barnett as preferred Liberal leader.

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Almost 54 per cent of people contacted by ReachTEL felt Mrs Harvey would do a better job compared with 46 per cent who were happy with Mr Barnett.

In September, only 30 per cent of voters believed Mrs Harvey would make a better leader.

University of WA political analyst William Bowe said the poll results confirmed the One Nation wildcard was in play at this State election.

“Particularly if polls like this one underestimate the support out there for One Nation,” he said.

“That has been the case before. If Pauline Hanson is already in the double figures then all she needs to do is blow into town in the last week of the election, create a publicity frenzy and she’ll get more disgruntled voters behind her.”

One Nation has not named candidates for the election, but WA spokesman Colin Tincknell said this week the party was seeking between 15 and 18 people to run for the Upper House and 25 candidates for Lower House seats.