Nevada Revised Statutes sections 293C.3572, 293C.361 and 293.740 govern campaigning and electioneering. The rules differ for early voting and Election Day:

Early Voting:
If the voting site is located on PRIVATE PROPERTY (mall, supermarket, etc.), no one may electioneer on the owner’s property without the owner’s permission (NRS 293C.3572).
If the voting site is located on PUBLIC PROPERTY, no one may electioneer within 100 feet of the voting area (NRS 293C.361)
Election Day:
No one may electioneer within 100 feet of the entrance to the building or structure in which a polling place is located (NRS 293.740)

Definition: NRS 293.740 defines electioneering as campaigning for or against a candidate, ballot question or political party by:
• Posting signs.
• Distributing literature.
• Using loudspeakers.
• Buying, selling, wearing or displaying any badge, button or other insignia. A person may wear political insignia while voting only if he or she is reasonably unable to remove or cover it.
• Polling or otherwise soliciting information from a voter as to how the voter intends to vote or has voted.
• Soliciting signatures for any kind of petition.