Conservative leader and Canada's Prime Minister Stephen Harper speaks during a campaign stop at a marine equipment shop in Regina, Saskatchewan March 29, 2011. REUTERS/Chris Wattie

TORONTO (Reuters) - Canada’s minority Conservative Party’s gap over the opposition Liberals narrowed ahead of the May 2 federal election, according to a poll released on Thursday.

The Nanos Research tracking poll of results over three days of surveys put support for the leading Conservatives at 39.1 percent, up 0.7 percentage points and 6.4 points ahead of the Liberals. Liberal support rose 4 percentage points to 32.7 percent.

Support for the left-leaning New Democrats fell 3.7 percentage points to 15.9 percent. The Bloc Quebecois had 8.7 percent support while the Green Party had 3.7 percent support.

The Conservatives, who held a 10-point lead over the Liberals in Wednesday’s Nanos tracking poll, would still retain a minority government in parliament.

The poll was a random telephone survey that Nanos conducts daily throughout the campaign, interviewing a new group of 400 voters.

The daily tracking figures are based on a three-day rolling sample of 1,200 interviews, with a margin of error of 2.8 percent, plus or minus, 19 times out of 20.