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From the article linked to:

Roberts and Justice Samuel Alito said only that the Wisconsin group's ads are not the equivalent of explicit campaign ads and are not covered by the court's 2003 decision.

Sounds to me like the door is still open to more successful challenges to McCain-Feigngold but could be convinced otherwise.

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Not very likely. SCOTUS ruled in 2003 that most of the law, including the restrictions on outside advertising, were Constitutional. Its rare for a decision to be overturned 4 years after its handed down.