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Since the development of modern survey methods, political scientists have identified gender-based differences in the political behavior of men and women. Early research found women to be less politically engaged than men and to be more likely to vote for right-wing parties (Lipset 1963). Beginning in the 1980s, however, these differences in political participation dissipated, and the gender-based pattern in vote choice was reversed (DeVaus and McAllister 1989; Inglehart and Norris 2000). These gender differences in political behavior, and the many others that could be added here, are commonly referred to as “gender gaps.”

Building on Mark Granovetter's concept of weak ties, we argue that diverse social networks can enhance the propensity of women to vote for a party of the Left. Using data from the 2000 Canadian Election Study, we test two hypotheses: First, the wider the range of women known, the more likely women are to vote for the Left, and second, the wider the range of higher-status women known, the more likely married women are to vote for the Left. We argue that socially communicated cues may be particularly consequential for women because they tend to know less about the parties and their platforms than men do. Accordingly, casual acquaintances can be an important source of new information for women. Women with more diverse ties to other women, we argue, are more likely to encounter women who are voting for the party of the Left and to recognize their shared interest in voting similarly. Our second hypothesis builds on Susan Carroll's argument that women require sufficient autonomy to express their gender-related interests in their choice of party. We argue that married women's political autonomy can be enhanced if their social networks include a range of women who do enjoy such autonomy. Ties with higher-status women can be a source of psychological resources that facilitate voting for a party of the Left. We find support for both of these hypotheses.