[Pollster1]

The Supremes have overturned their own rulings several times. Dred Scot was overturned by a change in the Constitution, but Plessy was overturned by Brown as probably the most significant Supreme reversal of its own decision.

There was also:
Lochner v. New York (1905) and Adkins v. Children's Hospital (1923) overturned by West Coast Hotel v. Parrish (1937);
Bowers v. Hardwick (1986) overturned by Lawrence v. Texas (2003);
Pace v. Alabama (1883) overturned by Loving v. Virginia (1967);
Austin v. Michigan State Chamber of Commerce (1990) was very recently overturned by Citizens United v. Federal Election Commission (2010).

[Repeal The 17th]

Thanks!