"The five-member majority definitely left the door wide open for a constitutional challenge of public employee forced dues," said Patrick Semmens, vice president for public information at the National Right to Work Legal Defense Foundation, which brought the suit. "Probably half of that opinion is about that issue, which they ultimately didn't even decide in the case. But (there was) a lot of language in there saying ... 'We want to talk about how this is a problem.' "