Social media has become a central platform for political communication, enabling parties to engage directly with voters, influence public discourse, and mobilize support. This study examines the relationship between political topics and user engagement on Instagram during the 2024 state elections in Germany. Applying a quantitative content analysis, we systematically analyzed posts from 41 official party and candidate accounts using a hierarchical topic classification model. Engagement metrics, including likes and comments, were analyzed to assess how different political topics, visual elements, and textual features influence interaction rates. Our findings reveal that emotionally charged content, particularly on topics such as immigration policy, security issues, and climate change, generated higher engagement levels compared to neutral policy discussions. Visual elements played a crucial role, with posts featuring human faces receiving significantly more likes than those without. Platform-specific dynamics influenced engagement, with Instagram favoring visually driven narratives and key textual elements embedded within images. The study also highlights platform-specific dynamics that shape political communication on Instagram, revealing structural patterns in content creation and interaction. By providing empirical insights into the effectiveness of political topics in driving engagement, this research contributes to the field of e-democracy and offers practical implications for campaign strategists aiming to optimize digital outreach.