Attorney General Steve Bullock has urged the U.S. Supreme Court to uphold Montana’s century-old ban on corporate spending in political races and reject an attempt to dismantle it. In a brief filed Friday for the state, Bullock and two associates asked the court to deny the attempt by American Tradition Partnership and others to review and overturn the Montana Supreme Court’s decision in December that upheld the state Corrupt Practices Act. “No precedent of this court supports summary invalidation of a long-established state law so critical to its republican form of government,” wrote Bullock and attorneys Anthony Johnstone and James Molloy for the state.