This secondary analysis of four large, nationally representative datasets examines how political ideology relates to metacognitive confidence in detecting political misinformation. The study investigates whether individuals with more extreme political views—regardless of ideological direction—display higher confidence in their judgments than politically moderate individuals. A symmetric relationship is expected, with metacognitive overconfidence being more pronounced at ideological extremes, while showing no systematic differences between conservatives and liberals. The analyses combine frequentist and Bayesian models to precisely quantify effects of ideological direction and extremity. The findings will provide new evidence on the role of metacognition in political judgment and belief formation.