Miller also announced Saturday that his office investigated nine complaints from voters concerning problems with voting machines.
The complaints were lodged after the Republican National Committee on Thursday alleged voting machines in Nevada and five other states are flawed and improperly showing voters choosing Obama when they thought they had selected Romney.
Miller said all nine voters voiced similar complaints but included both Obama and Romney supporters. All nine were able to eventually cast ballots for the candidate of their choice after fixing the problem on their own or getting help.
The secretary of state held a demonstration Saturday at a polling place in Las Vegas designed to show voting machines are reliable and cannot be pre-programmed.
"We dealt with these rumors before in 2010, and we know we won't be able to debunk every rumor," Miller told the AP. "But we want to share with the public that the machines work fine and votes will be counted fairly and accurately."