%0 Journal Article %T Party polarization and party structuring of policy attitudes: A comparison of three NES panel studies %A Layman, Geoffrey C. %A Carsey, Thomas M. %D 2002 %R 10.1023/A:1021820523983 %P 199-236 %J Political Behavior %V 24 %I 3 %2 ISSN: 0190-9320