Haugh is a longtime Libertarian Party activist who also ran for US Senate in 2002. His platform is focused on ending all wars, along with the expenditures thereof.
D'Annunzio is a former Republican who ran unsuccessfully for the 4th Congressional District in 2012 and the 8th Congressional District in 2010. He gained infamy in his previous runs for making a litany of extreme statements, and has drawn the ire of some Libertarian voters for running as a conservative rather than a libertarian as well as for supporting Greg Brannon, a candidate in the Republican primary.
As North Carolina has semi-open primaries, voters who were registered Libertarian (23,541 as of May 6) or Unaffiliated (1,741,983 as of May 6) could vote in the Libertarian primary election.
With all precincts reporting, Haugh won the primary election by a margin of 1,215 votes (60.69 percent) to 787 votes (39.31 percent). Haugh moves on to face incumbent Democrat Kay Hagan as well as Republican Thom Tillis in November.