Had the good fortunate to be on WFAE's Charlotte Talks talking about the rise of independent/unaffiliated voters in North Carolina. You can listen to the show here and here's the answer to Michael Tomsic's question about the role of unaffiliated registered voters participating in this past May's primary election: 18% if you take both primaries together, 22% in GOP primary, 12% in Democratic primary.
Also, here's a blog post on unaffiliated voters in NC that I wrote up for the show. For some reason, chart 3 isn't loading properly, so here it is as well: