For New Hampshire Democrats, rallying in the campaign’s final days, Sunday morning’s event in Concord will provide a rare moment for political junkies — two presidents of the United States, Barack Obama and Bill Clinton, speaking on the same stage. It’s like a rock ‘n’ roll fan attending a Beatles concert, with the Rollings Stones as the opening act. Of all the non-family surrogates in this campaign, perhaps none has worked as effectively for Obama as Clinton.
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