Key points are not available for this paper at this time.
William D. Berry, Evan J. Ringquist, Richard C. Fording, Russell L. Hanson, Measuring Citizen and Government Ideology in the American States, 1960-93, American Journal of Political Science, Vol. 42, No. 1 (Jan., 1998), pp. 327-348
Berry et al. (Thu,) studied this question.