Kasey Kahne (5) and Greg Biffle, top left, lead the start of the NASCAR Sprint Unlimited auto race at Daytona International Speedway, Saturday, Feb. 16, 2013, in Daytona Beach, Fla. (AP Photo/Terry Renna)

Associated Press
Kasey Kahne (5) and Greg Biffle, top left, lead the start of the NASCAR Sprint Unlimited auto race at Daytona International Speedway, Saturday, Feb. 16, 2013, in Daytona Beach, Fla. (AP Photo/Terry Renna)
Kasey Kahne (5) and Greg Biffle, top left, lead the start of the NASCAR Sprint Unlimited auto race at Daytona International Speedway, Saturday, Feb. 16, 2013, in Daytona Beach, Fla. (AP Photo/Terry Renna)
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