Barack Obama is leading Hillary Clinton by 50 percent to 41 percent in the next big primary state of North Carolina, according to a SurveyUSA poll conducted April 19-21. The margin of error is 3.7 percent and the number of undecided is 5 percent. This is a smaller lead than some other North Carolina polls have shown for Obama, but SurveyUSA says that margin has been “steady-steady.” Clinton’s only significant edge over Obama in any gender or age group is among voters over 65. Clinton leads 56 percent to 33 percent among white voters (64 percent of the sample) while Obama leads among black voters (30 percent of the sample) by 83 percent to 10 percent.