The Upshot has a table showing how often the various justices on the U.S. Supreme Court agree with each other. Unsurprisingly, the two justices that most often agree are Kagan and Sotomayor at 94%. What is more surprising is that the lowest ratio of agreement is 65%. Alito and Thomas share that ratio with Ginsburg. There is more harmony on the court than news reports would have us believe.
Hat tip to Jonathan Adler at The Volokh Conspiracy.