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The last thing Nancy Vawter expected when she went online with her 22-month-old granddaughter to watch the musician Raffi sing “Wheels on the Bus” was an ad for Scott Brown, the Republican challenging Sen. Jeanne Shaheen.

“Politics has no business being anywhere around children,” the Portsmouth resident said later, recalling her reaction.

But parents vote, and grandparents, too. As a result, the ad wars have invaded even the feel-silly online world of children entertainers in one of several close races that will determine whether Republicans win a Senate majority.