Days after Burns won, the nonpartisan Cook Political Report with Amy Walter moved the race from toss-up to leaning toward the Democratic incumbent Ann Kuster. On Tuesday, she won re-election.

Brett Broesder, the executive director of Democrats Serve PAC, said the attack ads in the primary were intended to put Kuster in the best position to win. He said it was also cost-effective.

“Less money needs to be spent in that race given the candidate,” he said.

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