If the Senate confirms Ms. Kagan, who is Jewish, the Supreme Court for the first time will have no Protestant members. In that case, the court would be composed of six justices who are Catholic and three who are Jewish. It also would mean that every member of the court had studied law at Harvard or Yale.
— New York Times: Obama Picks Kagan as Justice Nominee
http://www.nytimes.com/2010/05/10/us/politics/10court.html
http://www.nytimes.com/2010/05/10/us/politics/10court.html