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49 BYU L. Rev. 367 (2023-2024)
Twenty-First Century Split: Partisan, Racial, and Gender Differences in Circuit Judges following Earlier Opinions

handle is hein.journals/byulr49 and id is 383 raw text is: Twenty-First Century Split: Partisan, Racial, and
Gender Differences in Circuit Judges
Following Earlier Opinions
Stuart Minor Benjamin, Kevin M. Quinn & ByungKoo Kim*
Judges shape the law with their votes and the reasoning in
their opinions. An important element of the latter is which
opinions they follow, and thus elevate, and which they cast doubt
on, and thus diminish. Using a unique and comprehensive dataset
containing the substantive Shepard's treatments of all circuit
court published and unpublished majority opinions issued
between 1974 and 2017, we examine the relationship between
judges' substantive treatments of earlier appellate cases and their
party, race, and gender. Are judges more likely to follow opinions
written by colleagues of the same party, race, or gender? What we
find is both surprising and nuanced. We have two major findings.
First, over the forty-four-year span we studied, we find growing
partisan differences in positive treatments of earlier cases. The
partisan differences are largest for treatments in ideologically
salient categories of cases. Interestingly, the partisan differences
arise more for treatments of opinions written by Democratic
* Benjamin is the William Van Alstyne Professor of Law at Duke Law School; Quinn is a
Professor at Emory Law School and in the Department of Quantitative Theory and Methods
at the Emory College of Arts and Sciences; Kim is an Assistant Professor at the KDI School
of Public Policy and Management. More than the usual thanks are in order. We thank
LexisNexis, who shared their data with us in 2018 and patiently tracked down the answers
to our many questions about the data over the next twenty-seven months. A dataset so
massive required similarly massive work to identify, categorize, and organize its elements.
Tom Balmat at Duke and Sean Chen at the Duke Law Library were particularly valuable in
that lengthy process. Jane Bahnson and Wickliffe Shreve, also at the Duke Law Library, were
indefatigable in helping us find relevant materials about Shepard's, Lexis, and court practices.
Gloria Han, Andrew Tisinger, and Wenyi Zhou provided excellent research assistance, and
Leanna Doty and Balfour Smith provided excellent editing assistance. Over the five-year
gestation of the project, we have benefited from many colleagues' comments, including Matt
Adler, Joseph Blocher, Curt Bradley, Michael Frakes, Jack Knight, Maggie Lemos, Marin
Levy, Mat McCubbins, Darrell Miller, Jeff Powell, Neil Siegel, Georg Vanberg, Jonathan
Wiener, and Ernie Young. We also thank colleagues who attended our 2021 Duke Law
workshop on an early version of this Article as well as members of the Emory Law faculty
who attended a 2022 workshop on a version of this Article.

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