The Montana Supreme Court's campaign finance decision upholding a restriction on corporate electoral giving has been summarily reversed by the Supreme Court, 5 to 4, presumably on the strength of Citizens United. More later.
UPDATE: The decision is here. Justice Breyer's dissent ends with this note, which indicates that the votes are not now there to reconsider Citizens United:
Were the matter up to me, I would vote to grant thepetition for certiorari in order to reconsider Citizens United or, at least, its application in this case. But given the Court’s per curiam disposition, I do not see a significant possibility of reconsideration. Consequently, I vote instead to deny the petition.