Scholars have documented the deficiencies in political knowledge among American citizens. Another problem, misinformation, has received less attention. People are misinformed when they confidently hold wrong beliefs. We present evidence of misinformation about welfare and show that this misinformation acts as an obstacle to educating the public with correct facts. Moreover, widespread misinformation can lead to collective preferences that are far different from those that would exist if people were correctly informed. The misinformation phenomenon has implications for two currently influential scholarly literatures: the study of political heuristics and the study of elite persuasion and issue framing.

Scholars assume that citizens perform better when they know pertinent facts. Factual beliefs, however, become relevant for political judgments only when people interpret them. Interpretations provide opportunities for partisans to rationalize their existing opinions. Using panel studies, we examine whether and how partisans updated factual beliefs, interpretations of beliefs, and opinions about the handling of the Iraq war as real-world conditions changed. Most respondents held similar, fairly accurate beliefs about facts. But interpretations varied across partisan groups in predictable ways. In turn, interpretations, not beliefs, drove opinions. Perversely, the better informed more effectively used interpretations to buttress their existing partisan views.

Scholars of political behavior increasingly embed experimental designs in opinion surveys by randomly assigning respondents alternative versions of questionnaire items. Such experiments have major advantages: they are simple to implement and they dodge some of the difficulties of making inferences from conventional survey data. But survey experiments are no panacea. We identify problems of inference associated with typical uses of survey experiments in political science and highlight a range of difficulties, some of which have straightforward solutions within the survey-experimental approach and some of which can be dealt with only by exercising greater caution in interpreting findings and bringing to bear alternative strategies of research.

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