In an unprecedented move, Mayor Bloomberg and his national coalition against illegal guns plan to air a 30-second ad during the Super Bowl.

Bloomberg disclosed yesterday that he and Boston Mayor Tom Menino — who serves as both co-chair of the mayor’s coalition and mayor of the rival New England Patriots’ hometown — have already filmed the ad that’s going to be screened in selected regional markets on Sunday.

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“A New York-Boston Super Bowl is a perfect opportunity for the mayors to talk about fixing the nation’s background-check system,” said a Bloomberg spokesman.