This paper explores advanced prompting strategies for hyperpartisan news detection using the LLaMA3-8b-Instruct model, an open-source LLM developed by Meta AI. We evaluate zero-shot, few-shot, and Chain-of-Thought (CoT) techniques on two datasets: SemEval-2019 Task 4 and a headline-specific corpus. Collaborating with a political science expert, we incorporate domain-specific knowledge and structured reasoning steps into our prompts, particularly for the CoT approach. Our findings reveal that zero-shot prompting, especially with general prompts, consistently outperforms other techniques across both datasets. This unexpected result challenges assumptions about the superiority of few-shot and CoT methods in specialized tasks. We discuss the implications of these findings for ICL in political text analysis and suggest directions for future research in leveraging large language models for nuanced content classification tasks.