U.S. Democratic presidential candidate Obama speaks in front of a photovoltaic panel during a campaign visit to the Las Vegas Springs Preserve in Las Vegas

 
U.S. Democratic presidential candidate Obama speaks in front of a photovoltaic panel during a campaign visit to the Las Vegas Springs Preserve in Las Vegas
U.S. Democratic presidential candidate Barack Obama speaks in front of a photovoltaic panel during a campaign visit to the Las Vegas Springs Preserve in Las Vegas, Nevada June 24, 2008. REUTERS/Steve Marcus/Las Vegas Sun (UNITED STATES) U.S. PRESIDENTIAL ELECTION (USA)