4 July 2019

FiveThirtyEight: The Supreme Court Might Have Three Swing Justices Now

Now that this year’s Supreme Court term is over, we know that Kavanaugh is shaping up to be a solidly conservative justice — he barely beat out Roberts as the court’s new median and voted most frequently with Roberts and Justice Samuel Alito. And although Roberts did step several times into the role of “swing” justice, he wasn’t the only conservative justice who joined the liberals over the course of the term. Although he wasn’t in the middle ideologically, Justice Neil Gorsuch, Trump’s other nominee, was actually the most likely to join the liberals in closely decided cases.1 In fact, each of the conservative justices joined the liberals in a 5-4 or 5-3 decision at least once. With a newly cemented conservative majority on the court, the days of a single “swing” justice may be over. [...]

Last year, we wrote that Roberts would likely land at the ideological center of the court in Kennedy’s absence, and he did — but so did Kavanaugh, who voted in almost total lock-step with Roberts. In fact, Kavanaugh was actually slightly closer to the center than Roberts was, according to their Martin-Quinn scores, a prominent measure of judicial ideology calculated by scholars Lee Epstein and Andrew Martin of Washington University in St. Louis and Kevin Quinn of the University of Michigan using data from the Supreme Court Database.

Kavanaugh’s score this term is very similar to Kennedy’s score from the last term, but Kennedy was somewhat unpredictable in his last few years on the bench, occasionally shifting into liberal territory. The fact that Roberts and Kavanaugh are now at the median means the court’s ideological center will likely be solidly conservative going forward. The shift, though, didn’t put the court in dramatically new territory, since Kavanaugh’s score is still similar to Kennedy’s in many of the years when he was the median justice.

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