Agreement among the Supreme Court justices
The Supreme Court's 2012-2013 term made history by striking down key elements of the Voting Rights Act and the Defense of Marriage Act, both in 5 to 4 decisions. The percentage of 5-to-4 split cases this session was the court's highest since 2008, with Justice Anthony M. Kennedy most frequently voting with the majority. In the three major cases that ended the court’s term — affirmative action in higher education, the Voting Rights Act and the Defense of Marriage Act — Kennedy was the only justice in the majority each time. Read related article.
Percentage of time justices agreed with each other, in part or in full

Roberts

Scalia

Thomas

Alito

Kennedy

Breyer

Ginsburg

Sotomayor

Kagan
Decisions with this majority
Clapper v. Amnesty International
Comcast Corp. v. Behrend
Genesis HealthCare Corp. v. Symczyk
Salinas v. Texas
American Express Co. v. Italian Colors Restaurant
University of Texas Southwestern Medical Center v. Nassar
Vance v. Ball State University
Mutual Pharmaceutical v. Bartlett
Shelby County v. Holder
Koontz v. St. Johns River Water Management
SOURCE: SCOTUSblog.
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