2012 will be added to 1987 and 1943 as years that the NDP or it's predecessors have lead federal polling. Sitting at 36% the party is statistically tied with the Conservatives at 35%, and from a polling perspective, the 1 point lead is meaningless. Psychologically however this will be a huge boost to NDP supporters.
News is even better in Quebec, where the NDP now sits at 47%, ahead of the 43% they won in the last election, and far ahead of the 27% they were sitting at prior to Mulcair's victory. In that province, the Bloc sits at 29%, while the Liberals and Conservatives are tied at 10% each.
While Leger has yet to post the full details of the poll on their website, they are a firm that has done polls many times in the past and are credible. Once full details are available we will of course let you know.