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Voting patterns

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Partisan Voting On The California Supreme Court, Mark P. Gergen, David A. Carrillo, Benjamin M. Chen, Kevin M. Quinn Jan 2020

Partisan Voting On The California Supreme Court, Mark P. Gergen, David A. Carrillo, Benjamin M. Chen, Kevin M. Quinn

Faculty Articles

When did ideology become the major fault line of the California Supreme Court? To answer this question, we use a two-parameter item response theory (IRT) model to identify voting patterns in non-unanimous decisions by California Supreme Court justices from 1910 to 2011. The model shows that voting on the court became polarized on recognizably partisan lines beginning in the mid-1900s. Justices usually did not vote in a pattern that matched their political reputations and party affiliation during the first half of the century. This began to change in the 1950s. After 1959 the dominant voting pattern is partisan and closely …


Did A Switch In Time Save Nine?, Daniel E. Ho, Kevin M. Quinn Jan 2010

Did A Switch In Time Save Nine?, Daniel E. Ho, Kevin M. Quinn

Faculty Articles

Franklin Delano Roosevelt’s court-packing plan of 1937 and the “switch in time that saved nine” animate central questions of law, politics, and history. Did Supreme Court Justice Roberts abruptly switch votes in 1937 to avert a showdown with Roosevelt? Scholars disagree vigorously about whether Roberts’s transformation was gradual and anticipated or abrupt and unexpected. Using newly collected data of votes from the 1931–1940 terms, we contribute to the historical understanding of this episode by providing the first quantitative evidence of Roberts’s transformation. Applying modern measurement methods, we show that Roberts shifted sharply to the left in the 1936 term. The …