The past four weeks have shown a slow erosion for the Conservatives in the as they continue to trail the Liberals. The federal Liberals registered 57 points out of a possible 100 points on the index followed by the Conservatives at 50 points, the NDP at 50 points, the Green Party at 31 points and the BQ at 27 points (QC only).

The Nanos Party Power Index methodology comprises a basket of political goods that includes ballot preferences, accessible voters, preferred PM views and evaluations of the leaders. It is modeled similar to a standard confidence index.

Liberal Leader Justin Trudeau has numerically surpassed Conservative Leader Stephen Harper on the preferred Prime Minister front for the first time since the end of October 2014 but the two leaders remain in a dead heat. Thirty one per cent of Canadians prefer Trudeau as PM, 30 per cent prefer Harper, 18 per cent prefer NDP Leader Thomas Mulcair, five per cent prefer Green Leader Elizabeth May and 15 per cent were unsure.

Asked whether they would consider or not consider voting for each of the federal parties through a series of independent question, 57 per cent of Canadians would consider voting Liberal, 47 per cent would consider voting NDP, 42 per cent would consider voting Conservative and 27 per cent would consider voting Green.

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