Last night at the debate -- at the Republican debate, not only did Ron Paul express a concern about that provision but Rick Santorum, not known for being libertarian or liberal on these issues, said that he thought the way the law was before was more appropriate than this new law.

WHITEHOUSE: Press Briefing

The case pitted American Express against various merchants, which asked the Court to strike down a provision in their contracts with the credit card giant forbidding them from forming class actions.

FORBES: Supreme Court Could Further Curtail Class Actions