A federal judge Tuesday refused to block Montana’s law forbidding political parties from endorsing a nonpartisan judicial candidate, saying their involvement could transform judicial contests into partisan races. U.S. District Judge Charles Lovell of Helena said Montana clearly has an interest in maintaining a fair, impartial judiciary – and that keeping political parties out of judicial elections might be allowed to achieve that goal. “If … political parties were permitted to endorse nonpartisan judicial candidates, then the elections might be nonpartisan only in form,” he wrote. “Nonpartisan elections, perhaps, can truly be nonpartisan only if political parties are prohibited from endorsing candidates.”