A new poll suggests Canada’s three biggest political parties remain virtually tied.

ballot tracking of voters’ top two preferences has found that 31.2 per cent of 1,000 respondents are considering voting Conservative, 30.4 per cent are considering the NDP and 28.6 per cent are considering the Liberals.

Five per cent picked the Greens and 4.2 per cent chose the Bloc Quebecois.

That puts the Conservative party up a couple percentage points from where they were four weeks earlier in the Nanos ballot tracking, with the NDP and Liberals almost unchanged, and the Greens and Bloc each down about one percentage point.

Respondents were also asked whether they would consider voting for each party. On that question, the Liberals were up a few points compared to four weeks earlier (from 43.5 per cent to 46.1 per cent), the Conservatives were down a few points (from 42.2 per cent to 39.2 per cent), and the NDP were also down (from 53.3 per cent to 49 per cent).

The Liberals remained the top choice in Atlantic Canada, with 48 per cent picking them.

The NDP continued to lead in Quebec (39 per cent) and British Columbia (41 per cent).

The Conservatives, meanwhile, remained on top in the Prairies (56 per cent) and appear to have pulled ahead slightly in Ontario (37 per cent), where they were tied with the Liberals four weeks earlier.

Nanos weekly ballot tracking is based on random landline and cellphone interviews with 1,000 adult Canadians, and may be weighted by age and gender. The current report is based on a four-week rolling average ending Aug. 7, 2015. A random telephone survey of 1,000 Canadians is accurate plus or minus 3.1 percentage points, 19 times out of 20.