Voters on Tuesday are also deciding inter-party races for Nevada lieutenant governor, secretary of state, treasurer and attorney general.
They'll narrow the field in nonpartisan runoff races for the state Supreme Court and Clark County sheriff. Voters will settle about 30 primary battles for state legislative seats.
One of those races in Nye County pits incumbent Assembly member James Oscarson of Pahrump against Nevada's most famous pimp, Dennis Hof.
Hof, who starred in the HBO adult reality series "Cathouse," owns half a dozen brothels that could be threatened this year under proposals to ban such businesses in two of the state's seven counties where they're legally operating.
Hof has said the proposed brothel bans are a political attack tied to Oscarson, something Oscarson has denied.