Montana’s attorney general is due to file a brief Friday in the U.S. Supreme Court, asking it to uphold the state’s Corrupt Practices Act. This 1906 law prohibits corporations from making expenditures on behalf of candidates in Montana elections.

The Supreme Court’s response could have repercussions far beyond Montana — the case may well determine how much states can regulate money in politics after Citizens United. The state high court cited Montana’s long history of corruption, when corporations often spent unlimited sums to steal elections, as the reason to narrow Citizens United and uphold the law.

The Supreme Court should heed the Montana attorney general’s argument. More important, this case could offer the high court a viable means to revisit its Citizens United decision. This 2010 ruling, extended by lower federal courts, has spawned the super PACs now threatening to bring Wild West corruption to federal elections.

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