The Supreme Court on Monday reversed a Montana ruling that blocked corporations from spending unlimited amounts of money to influence state and municipal elections there, disappointing Massachusetts officials and watchdog groups who fear the decision would lead to local corruption. Massachusetts was one of 22 states that supported Montana’s challenge to the court’s 2010 Citizens United ruling, which unleashed independent political spending by corporations. More than $158 million has been spent by super PACs and other independent groups on this year’s elections, according to the Center for Responsive Politics, and analysts say $1 billion could be used.
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