Because unlimited corporate expenditures do not cause corruption, you know.
From the dissent:
(the decision is as brief as humanly possible: http://www.supremecourt.gov/opinions...1-1179h9j3.pdf )Moreover, even if I were to accept Citizens United, this Court’s legal conclusion should not bar the Montana Supreme Court’s finding, made on the record before it, that
independent expenditures by corporations did in fact lead to corruption or the appearance of corruption in Montana. Given the history and political landscape in Montana, that
court concluded that the State had a compelling interest in limiting independent expenditures by corporations.