@conference {4572,
	title = {Constraint, Ideology, and Polarization in the American Electorate: Evidence from the 2006 Cooperative Congressional Election Study},
	booktitle = {2007 Annual Meeting},
	year = {2007},
	publisher = {American Political Science Association},
	organization = {American Political Science Association},
	author = {Abramowitz, Alan I.}
}
