This article considers the degree to which characteristics of the ideological model of political parties are evident in the Canadian party system. Four questions are considered: are members attracted to parties on the basis of their policy positions; is there a structure to party members' issue attitudes; is there significant attitudinal space between the parties; and is there cohesion within the parties on the identified attitudinal measures? Data collected through a national mail survey of members of the five federal parties are used to answer these questions. The article finds there is substantial evidence of the ideological model in the Canadian party system and concludes by considering the effect this may have on the brokerage traditions of Canadian parties.