The Politico offers this report. A snippet:

“It is not often in the law that so few have so quickly changed so much,” Breyer said, reading his dissent from the bench to a 5-4 ruling that overturned school desegregation policies in two cities.
Roberts has defended his rulings as applications of “existing precedent.”
Specter, however, said Breyer’s statement was “an especially forceful criticism of the Roberts court.”
“I only noticed it in a couple of cases,” Specter said of the court overturning or undermining precedents. But Breyer, in their Aspen conversation, said “there were eight.”
Those that have earned the most criticism from liberals were rulings that struck down desegregation programs, upheld a federal law prohibiting late-term abortions and weakened restrictions on broadcast ads during campaigns.

Soon I’ll have something much more extensive on the campaign finance case, WRTL, which I believe supports Justice Breyer’s point. UPDATE: Bob Bauer comments.