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Senator Jeanne Shaheen (D., N.H.) had a rough time before another debate audience when she interrupted Republican challenger Scott Brown’s closing remarks this weekend, drawing jeers.

Wrapping up the event in Manchester, Brown mentioned his endorsement from the National Federation of Independent Businesses and the “zero” rating the organization has given Shaheen. She interrupted that the group was “Koch Brothers–funded,” to which the crowd immediately started shouting “rude.”

“I would like to defer to Senator Shaheen,” Brown said, giving her the floor.

Shaheen said she didn’t understand the objections to her comments. “Well, because I was in my closing, and I gave you the courtesy​ to speak,” Brown replied, garnering applause from the audience.