The Angus Reid poll (re Khadr) involved 1521 people drawn from the Angus Reid forum. 488 of the respondents in the1521 said either, they 'did not know anything about Khadr or his story' (212 people), or that they 'recognize the name but have not followed the story/didn't know much about it' (276), then the 1033 who knew 'something' or 'a lot' about it could not give a result with the same statistical significance. The people who knew essentially nothing about the story still voted 70% and 73% respectively against the decision. Shouldn't a poll reflect the opinion of those who 'know something'? Did you know 1 in 3 were not informed? Had the sample included 2 in 3 respondents who 'did not know' and voted in the same way would you still have found the poll significant? My interpretation is that this was a vote against Trudeau because the respondents were asked if, 'The Trudeau government did the right thing by settling the case .......' 
The G&M should do some delving into polling.