it comes courtesy of the WSJ newsroom and it's found in the third paragraph of the daily's A1 article on Justice John Paul Stevens' retirement announcement:

The announcement marks another step in the transformation of the American elite. Justice Stevens, who turns 90 later this month, is the only Protestant now on the court. Once entirely Protestant, the court now has six Catholics and two Jews. Among the top three candidates to succeed Justice Stevens, two are Jewish and one is Protestant.