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ALEXANDRIA, VA - AUGUST 17: Stock photographs representing children who have died after being left unattended in vehicles are on display during a news conference to launch the 'Look Before You Lock' campaign at the Campagna Center at George Washington Head Start August 17, 2012 in Alexandria, Virginia. 23 children in the United States have already died from hyperthermia this year after being left in hot cars. (Photo by Chip Somodevilla/Getty Images)

ALEXANDRIA, VA - AUGUST 17:  Stock photographs representing children who have died after being left unattended in vehicles are on display during a news conference to launch the 'Look Before You Lock' campaign at the Campagna Center at George Washington Head Start August 17, 2012 in Alexandria, Virginia. 23 children in the United States have already died from hyperthermia this year after being left in hot cars.  (Photo by Chip Somodevilla/Getty Images)