Within the German political blogosphere the campaign for the early elections in 2005 was some kind of kick-off. For the first time, party organizations and political candidates used this form of political communication to establish contact with their constituents, to such an extent. This paper tries to combine two strains of research to estimate the potential of weblogs as a campaigning instrument. First, content analysis data of about 3000 posts in party and candidate weblogs in the last eleven weeks before Election Day will be analyzed. Second, with regard to survey data of about 1300 internet users, insights into the use and acceptance of the parties’ weblog campaign should be provided. By combining data from both participants in weblog-based political communication – political parties and citizens – our paper provides some answers to the question of whether campaigning via weblogs can be a success. Against this background, the crucial factors for effectual weblog-based electioneering and for a better mobilization of citizens via weblogs should be presented.