How do partisan citizens respond to campaign information and make voting decisions? We theorise that the association between exposure to campaign information and partisan voting is moderated by citizens' political predispositionsstrength of partisanship, political sophistication, and election interest. To test our expectations, we used Australian Election Studies data from 2013, 2016, and 2019. We found that partisans who are exposed to campaign information tend to follow their party preference when strength of partisanship is high. For political sophistication, we found that the influence of campaign information on partisan voting is not conditional on sophistication. For election interest, we found a moderating effect of election interest whereby partisan individuals who encountered campaign information were more inclined to choose their own party when interest was low and more inclined to support their opposing party when interest was high.Over recent decades scholars have documented that campaigns do matter and can be pivotal in deciding voters' choices, but not for everyone. 1 Existing literature shows that citizens vary systematically in their susceptibility to the information supplied by political campaigns. For example, although political independents are heavily influenced by campaigns, 2 partisan voters are also susceptible to the effects of campaigns because partisan activation is the primary dynamic of campaigns. 3 Therefore, the more interesting issues are for whom and under what conditions campaigns matter.In this paper, we concentrate on partisans, who identify themselves, psychologically, with a party, and explore the conditions under which partisans might be more responsive or more resistant to campaign efforts when making voting choices. Empirical research presents starkly different predictions about how partisans respond to campaign effects, which in turn affects voting decisions. There is considerable evidence that partisans in the electorate overwhelmingly vote for co-partisan candidates. 4 This suggests that partisans are impervious to campaign primes and messages that