Obama supporters accuse the Romney campaign of packing the room with supporters.

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"Compare it to a purely classroom-based subject, like English or history, where you can achieve greater economies of scale by packing out a lecture room, " says Prof Smith, of Swansea University.

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Instead of packing executives into a conference room and brainstorming solutions, Keeney met for one hour each with 19 top people, including the CEO.

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