Mr. Biden: Two State Nevada Troopers killed in the line of duty; they were helping a driver on the side of the freeway, and they were killed by a hit-and-run driver. Then two days later, a gunman opened fire at the University of Nevada, Las Vegas.

Mr. Biden: The idea; if you were driving your automobile here, and you left the key in the ignition, and a kid came up and jumped in and stole it and then got in a crash, you're liable civilly. Why in God's name do people not have to lock up their firearms?