A billboard advertising a gun tourism business in Las Vegas hovers above the Mandalay Bay Hotel, site of a mass shooting Sunday night that killed 58 people and injured nearly 500. Monika Evstatieva/NPR hide caption

Former NFL football star O.J. Simpson enters for his parole hearing Thursday at the Lovelock Correctional Center in Lovelock, Nev. The panel decided Simpson could be released as early as October after serving 9 years in prison. Jason Bean/The Reno Gazette-Journal/AP hide caption

A man tends to marijuana plants at a 54,000-square-foot marijuana cultivation facility in Las Vegas. In Nevada's first weekend of recreational pot sales, "well over 40,000 retail transactions" were carried out, tax officials say. Ethan Miller/Getty Images hide caption

A bill that would allow Nevadans without insurance to buy into Medicaid starting in 2019 awaits Gov. Brian Sandoval's signature or veto. Kevin Clifford/AP hide caption

Nevada Gov. Brian Sandoval plans to sign a bill will let homeowners with solar panels sell excess electricity to their utility at retail rates, his office says. Drew Angerer/Getty Images hide caption

Spectators look down on the Nevada Assembly on the opening day of the legislative session in Carson City, Nev., in February. On Wednesday, state senators backed the Assembly and voted to adopt the Equal Rights Amendment. Lance Iversen/AP hide caption

This illustration depicts Klebsiella pneumoniae bacteria, which can cause different types of infections, including pneumonia, bloodstream infections and meningitis. CDC hide caption

Vineyards remain flooded in the Russian River Valley in Forestville, Calif., on Monday. A massive storm system stretching from California into Nevada saw rivers overflowing their banks, flooded vineyards and forced people to evacuate their homes after warnings that hillsides previously parched by wildfires could give way to mudslides. Eric Risberg/AP hide caption

Beverly Kurtz and Tim Guenthner live near Gross Reservoir outside Boulder, Colo. They oppose a an expansion project that would raise the reservoir's dam by 131 feet. Grace Hood/Colorado Public Radio hide caption

Marcela Stewart speaks to a voter at an event to encourage minority voter turnout n Cutler Bay, Fla., on Sunday. Kerry Sheridan/AFP/Getty Images hide caption

After a perceived security threat, Secret Service agents rush Republican presidential candidate Donald Trump off the stage at a campaign rally in Reno, Nev., on Saturday. John Locher/AP hide caption

The area around Reno, Nev., is seeing some of the demographic changes that have been at the center of some of the most contentious debates of this campaign. Bloomberg via Getty Images hide caption

For Vernon Lee of the Moapa Band of Paiutes, a national monument designation for Gold Butte would be the next best thing to having the U.S. government return the land to his people. Kirk Siegler hide caption

Sen. Kelly Ayotte, R-N.H., and Sen. John McCain, R-Ariz., seen here in 2012, are both facing competitive elections in 2016. Charles Krupa/AP hide caption

Democratic congressional candidate Lucy Flores speaks at a campaign rally for Democratic presidential candidate Bernie Sanders in February in Las Vegas. Ethan Miller/Getty Images hide caption