This article examines the influence of ideology in Canadian politics. The core theory is that political opinions are bound together into ideological clusters by underlying influences that affect simultaneously the opinions of individuals about more than one issue. The central hypothesis is that ideological disagreement between the left and the right is asymmetrical, that is, that leftists and rightists bundle in different ways their opinions about issues. The analysis draws on evidence from Benoit and Laver's survey of experts (2006) about the policy positions of political parties, the Comparative Manifesto Research Project (Budge et al., 2001; Klingemann et al., 2006), and Cross and Young's survey of Canadian political party members (2002). The results of the analysis indicate, first, that Canada's left/right ideological divide is wide by cross-national standards, and, second, that leftists and rightists organize their opinions about the world in different ways.