Data are available from the CES archive, hosted by the Canadian Opinion Research Archive: http://www.queensu.ca/cora/ces.html
The 2011 CES is also downloadable as a zip file HERE.
All survey questionnaires are available both in CATI script, and in "clean" formats that are easier to read. Note that each survey wave is a different questionnaire: CPS is the Campaign Period Survey (by telephone), PES is the Post-Election Survey (by telephone), MBS is the Mailback Survey, and WEB is the final Web-based survey.
The correct citation for the survey is: Fournier, Patrick, Fred Cutler, Stuart Soroka and Dietlind Stolle. 2011. The 2011 Canadian Election Study. [dataset]
We are also distributing a merged file of the 2004, 2006, 2008 and 2011 CES studies. Some respondents were panelists that participated in different studies. (Full information on the specific survey waves for which each respondent is available is noted in the first variable of the dataset.) You can download that survey file in both SPSS and STATA formats HERE.