Source: Pew Research
Link to August 3 Pew Research for the People & the Press report, "The Invisible Court".
Excerpt: The public often has little to go on when making judgments about the court and its ideology. The Supreme Court's workings are largely hidden from the public's view; its proceedings are not televised and sitting justices seldom give interviews. President Obama cast a rare spotlight on the court in his State of the Union address when he condemned the court's decision allowing corporate spending in elections; Roberts later took the unusual step of publicly criticizing the president's broadside.
Such high-profile incidents involving court decisions are few and far between. As a result, the little that the public learns about the court often comes from the confirmation of new justices. The increasing perception of the court as liberal may partly stem from the fact that the court's most recent nominees -- Kagan and Sonia Sotomayor -- were selected by a Democratic president.
[Thurgood Marshall, July 2, 1908 – January 24, 1993]