Statistics Canada is the central statistical agency for Canada and the provinces.
Open Data is the one-stop shop for Government of Canada open datasets.
Check <odesi> (datasets are available for subscribing institutions only) for social science data, including polling data.
Print materials: visit the Government Publications Collection on the 5th floor of Robarts (filed by Statistics Canada number, eg. 12-008).
Statistical databases accessible through the University of Toronto Data Centre (CHASS) (for UofT faculty, staff, and students only).
Check Canadian data sources available through the University of Toronto Data Library.