Despite a number of controversies on Parliament Hill, the Conservatives now enjoy a four-point advantage over the Liberals, according to a new poll conducted for CTV and the Globe and Mail.

Tory support increased from 34.7 per cent in early March to 37.2 per cent, according to the Nanos Research survey.

Here are the national standings (differences between a similar poll from March in brackets):

  • Conservatives: 37.2 per cent (+2.5)
  • Liberals: 33.2 per cent (-1.4)
  • NDP: 16.2 per cent (-1.6)
  • Bloc Quebecois: 9.6 per cent (+1.9)
  • Green Party: 3.8 per cent (-1.4)

The Conservatives' largest gains were in Atlantic Canada and the Prairies.

The Liberals lost the most support in Quebec and the Prairies, while the NDP's numbers fell the most in Atlantic Canada and the Prairies.

"I think Canadians are crediting the Conservatives for the economic turnaround," said CTV's Ottawa Bureau Chief Robert Fife. "The Liberals have been focused on the detainees and on scandal, and not on bread-and-butter issues that affect Canadians on Main Street."

About 22 per cent of those polled were undecided, up from 19.6 per cent in March.

Sample size and margin of error:

  • Canada: 1,003 -- 3.5 per cent
  • Atlantic: 73 -- 11 per cent
  • Quebec: 198 -- 7.1 per cent
  • Ontario: 240 -- 6.4 per cent
  • Prairies: 159 -- 7.9 per cent
  • British Columbia: 110 -- 9.5 per cent

Technical notes:

  • Interviews were conducted between April 30th and May 3.
  • Findings were based on 1,003 telephone surveys of voting-age Canadians. Of those, 780 were "committed voters."
  • "For those parties you would consider voting for federally, could you please rank your top two current local preferences?" the poll asked.