Democratic U.S. Senate candidates Elaine Marshall and Cal Cunningham will settle their campaign rivalry in a head-to-head runoff.
Marshall and Cunningham rose to the top of a crowded primary Tuesday that drew a half-dozen candidates looking to unseat Republican Senator Richard Burr.
Marshall, the secretary of state, led Tuesday night's unofficial results with 37 percent of the vote and Cunningham, a former state senator, ran 10 percentage points behind. Attorney Ken Lewis was in third place with 17 percent of the vote.
A candidate needed support from 40 percent of voters to avoid a runoff next month.
Burr easily defeated his three Republican opponents.