The voters who had no party affiliation were allowed to vote in democratic primary so I would not count them as new voters.
For those interested, I'll be speaking as part of a panel discussion on the case this Thursday night, sponsored by ACLU@DUKE. The talk is at 7pm, in the Von Canon Center (lower level of the Bryan Center on Duke's West Campus) . The panel also includes Stephen Miller, whose columns and public appearances helped crystallize Duke student opinion on the case.