How do countries' institutional and political features define the mobilization strategies parties adopt? How do politicians target voters during elections? Are certain individuals more likely to be targeted by political parties?My work aims to contribute to the literature of comparative politics including the importance of social context in explain mobilization strategies. It focuses on three levels of analysis: the country-level, the partisan level, and the individual level. Particularly, I claim that the way in which politician contact individuals in different countries are the result of mediating conditions: features of the political system (regulatory environment), the party system characteristics, and nature of the electorate.Campaigns are extremely important for representation and for democracy. They are thought to be not only a key mechanism for mobilizing voters but also a crucial point of interaction between politicians and voters. By investigating how the socio-political context influences the behavior of political elites, my research sheds light on an important phenomenon of campaigns and democracy