"Despite a flurry of anti-dark money rhetoric, federal election filings show" Sen. Dean Heller (R) and Rep. Jacky Rosen (D) "have benefited from more than $16.9 million spent by outside political advocacy groups — including funds from dark money organizations that don’t disclose their donors, according to a Reno Gazette Journal review of federal campaign finance data compiled by ProPublica."
“The nearly $17 million spent by outside groups may account for just a fraction of the total that dark money organizations have funneled into the Silver State's closely watched Senate contest, since some of those groups are only required to disclose explicit election-related spending to the Federal Elections Commission.”
"The vast majority, about 89 percent, of dollars spent by the groups has gone toward ads and other services bashing Heller or Rosen. Only about 11 percent has sought to encourage voters to support one of the candidates."
Pro-Rosen groups have spent $10.8 million on anti-Heller ads, with Senate Majority PAC the biggest player. Pro-Heller groups have spent $4.1 million on anti-Rosen ads, with Senate Leadership Fund leading the way.
"Meanwhile, both Nevada Senate hopefuls continue to rail against their opponent for cozying up to outside spending groups. Two months ahead of high-profile general election, neither has asked those groups to put away their checkbooks." (Reno Gazette Journal)