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Supreme Court won't revisit Citizens United

In addition to its ruling on Arizona's immigration law, the U.S. Supreme Court today declined to revisit its controversial 2010 Citizens United decision, which permits corporations and labor unions to freely make independent expenditures in political campaigns.

What's more, in a 5-4 vote, "the majority summarily reversed a decision of the Montana Supreme Court that had refused to follow the Citizens United decision," the New York Times says.

The case involved Montana's Corrupt Practices Act. It requires corporations in the state to form what are essentially political action committees (PACs) and to spend only money that was given voluntarily by employees and shareholders. When the law was challenged as contrary to the Citizens United decision, the Montana Supreme Court upheld it as justified by the state's long history of political corruption. Besides, the state court said, the law doesn't run counter to Citizens United because corporations in Montana can still express their political views through the voluntary PAC-type funds. State regulations, the court said, are far simpler than federal campaign funding rules, imposing no real burden on corporate expression.