What is less important is how they lean, what is more important is who appointed them and who they have their loyalties to. Their voting record tells even more.
104 Anthony Kennedy Reagan
106 Clarence Thomas Bush, G. H. W.
107 Ruth Bader Ginsburg Clinton
108 Stephen Breyer Clinton
109 John G. Roberts† Bush, G. W.
110 Samuel Alito Bush, G. W.
111 Sonia Sotomayor Obama
112 Elena Kagan Obama
This will mean if Obama gets his way he will have put in place 1/3 of the entire supreme court.
http://www.infoplease.com/spot/supreme-court.html