The polls are tightening in North Carolina and Barack Obama’s lead seems to be dwindling just days before the primary there. Not long ago, Mr. Obama was perceived to hold such an advantage that some Democrats here wondered whether Mrs. Clinton would bother to compete vigorously. But the candidates intensified their efforts in the final weekend — both appeared here on Friday evening — and Mr. Obama was eyeing a return on the eve of the election. “This primary...



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