The EKOS poll, done for the Toronto Star and La Presse and published on Thursday, shows the Conservatives with a lead of nearly six percentage points over the Liberals.
It's the first time since the beginning of the campaign a poll has indicated the Tories in a clear lead across the country.
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The Conservatives had the support of 36.2 per cent of the people surveyed, while 30.4 per cent said they would vote Liberal.
That lead is larger than the poll's margin of error – 2.7 percentage points, 19 times out of 20 – indicating a clear lead.
The results are based on a sample of 1,386 respondents who were questioned Tuesday and Wednesday.
Another poll released Wednesday, by SES Research, showed the two parties in a statistical tie.
Other recent polls have shown the Conservatives gaining on the Liberals, who went into the campaign with the lead.
The latest EKOS poll showed the NDP had the support of 17.9 per cent, and the Bloc Québécois had 10.4 per cent of support nationally.
EKOS also showed that Liberal support had slipped in Ontario, where the Conservatives have to make significant gains.
The Tories were also in a statistical tie with the Liberals in Quebec. That rise apparently came at the expense of the Bloc, suggesting that the Conservatives' strategy of presenting themselves as an alternative for Quebec federalists angry with the Liberals has worked.
