Barack Obama has a 52 percent to 42 percent lead over Hillary Clinton in North Carolina where Democrats go to the polls next week, according to an American Research Group poll conducted April 26-27. The margin of error is 4 points. These results are unchanged from what ARG reported a month ago. Clinton leads among white voters (62 percent of the sample) by 57 percent to 36 percent while Obama has an 83 percent to 13 percent among black voters (33 percent of the sample).