Not only is that his own riding, but the CBC bends over backwards to explain it away:
"The margin of error is just over five points, but that is for the entire sample. For the 281 decided voters in the CROP poll, the margin of error increases to plus or minus 5.8 per cent, which is almost enough to erase the gap between Lagacé Dowson and Trudeau.
Calculations related to the margin of error, however, are based on the assumption that the sample is random and represent- ative. And there are reasons to believe that this might not be the case with this poll."