Colin Barnett and the Liberals are back.

An exclusive ReachTEL poll for The Weekend West has Labor and the Government back level pegging at 50-50 on a two-party preferred basis with three weeks to go to the State election.

The result represents a 7.3 per cent swing to Labor compared with the 2013 election result, which would leave it two seats short of the 10 it needs to pinch from the Liberals to gain power.

While Labor leader Mark McGowan leads Mr Barnett as preferred premier 53-47, this too has tightened from 56-44 a month ago and is well in from a 61-39 blowout in the popularity stakes a year ago.

Both major parties’ primary votes improved slightly since last month but Labor’s 2PP result suffered from a 0.4 percentage point drop in Greens support while the Liberals benefited from a 2.4 point rise in the Nationals’ vote.

The dwindling number of days to the election has brought a reduction in undecided voters, from 8.5 per cent to 5.5 per cent, and twice as many who are still on the fence are leaning towards the Liberals (42 per cent) than Labor (20.4 per cent).

The drift to the Liberals could have been stronger but for a distaste among many voters for its preference deal with One Nation, which dominated the election campaign this week.

Play Video On a two-party preferred vote 58 per cent backed Mark McGowan, an 18 per cent swing from the 2013 election. The West Australian Video On a two-party preferred vote 58 per cent backed Mark McGowan, an 18 per cent swing from the 2013 election.

Support for Pauline Hanson’s party nudged up from 10.8 per cent to 11.1 per cent, according to the Statewide poll of 1652 voters on Wednesday night. The dead heat 2PP result, in from 48-52 to Labor a month ago, will come as a significant morale boost to Mr Barnett’s troops, who were staring into the abyss a year ago when the Opposition opened up a a 12-point lead.

This week, details of internal Liberal party polling reportedly showing a landslide victory to Mr McGowan was leaked to News Corp, interpreted by some as an attempt to shock latent supporters of the Government into action.

Mr Barnett told a business audience this week the temptation to give Labor a go after 81/2 years of the Liberal-National alliance was the greatest single factor he had to overcome.

The same day, Mr McGowan insisted Labor’s required number of seats represented “a mountain to climb”.

Mr Barnett yesterday campaigned with former prime minister John Howard in Perth, before announcing $47 million for cycling infrastructure, including a path from Joondalup to the Perth CBD and $9.3 million for mountain bike trails.

Mr McGowan announced a natural-birth centre and medi-hotel for Fiona Stanley Hospital.