Groups that don’t have to publicly reveal their donors are behind a significant chunk of campaign ads airing ahead of Nevada’s June primaries, led by one tied to Gov. Joe Lombardo’s (R) re-election campaign, a Nevada Independent analysis found. Advertisers have spent about $14 million on airtime so far this year, but more than one-third of those dollars are from groups whose funders’ identities aren’t public information, according to an analysis of data from the ad-tracking firm AdImpact. It