The Soul of a Polarized Democracy

This study explores the relationships between discussion networks and the development of extreme attitudes toward stem cell research during the 2004 presidential election. The authors test competing theoretical models that address discrepancies in previous attitude polarization research—whether interpersonal discussion leads to attitude extremity or extremity leads to discussion, within the deliberating American public. Using data from a nationwide mail panel survey carried out between 2002 and 2005, the authors explore within-wave and between-wave causal paths, revealing patterns difficult to discern in cross-sectional survey or lab experimental designs. Our findings show that political talk plays a substantial role in shaping and polarizing attitudes on stem cell research, with discussion in networks composed of like-minded others leading directly to the development of extreme attitudes.

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