CARSON CITY, Nev. (AP) -- The Nevada State Democratic Party has filed a complaint with the secretary of state's office against Americans for Prosperity, alleging the conservative group violated state election law by not registering in the state or disclosing finances.
The complaint focuses on mailers sent before the June primary that Democrats argue were targeted against Assemblyman Kelvin Atkinson in his state Senate race. Atkinson faces Republican Linda West Myers in November.
A spokesman for the organization said the complaint is frivolous and the mailer was intended to educate voters on economic policies.
Americans for Prosperity is an issue advocacy group founded by billionaire brothers Charles and David Koch.
On Thursday the group launched a statewide anti-Shelley Berkley bus tour. Berkley is running for the U.S. Senate against Republican incumbent Dean Heller.