RALEIGH, N.C. (AP) -- Dozens of volunteers armed with clipboards and voter registration forms gather at President Barack Obama's Raleigh, N.C., field office every day. Their mission: Fan out across the city seeking new voters in the rapidly growing state.

Obama's team says the effort has apparently borne fruit -- to the tune of more than 250,000 new registered voters in North Carolina since April 2011, more than the campaign has registered anywhere else in the country.

It's an eye-popping total in a state Obama won by just 14,000 votes four years ago. And the flood of new voters -- presumably a chunk of them Democrats -- could help keep North Carolina within the president's reach in a year when everything else in the state seems to be going Republican Mitt Romney's way.

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