Kyle Busch, center, celebrates, as the team drenches his wife, Samantha Busch, left, in victory circle after winning the NASCAR Sprint Series auto race in Fontana, Calif., Sunday, March 23, 2014. (AP Photo/Alex Gallardo)
Driver Carl Edwards takes a victory lap with the checkered flag after winning the NASCAR Sprint series auto race at Bristol Motor Speedway on Sunday, March 16, 2014, in Bristol, Tenn. (AP Photo/Andre Teague/Bristol Herald Courier)
Driver Carl Edwards celebrates at the finish line after winning the NASCAR Sprint series auto race at Bristol Motor Speedway on Sunday, March 16, 2014, in Bristol, Tenn. (AP Photo/Andre Teague/Bristol Herald Courier)
Spectators cover up as rain falls, suspending the NASCAR Nationwide auto race on Saturday, March 1, 2014, in Avondale, Ariz. (AP Photo/Ross D. Franklin)
Spectators cover up as rain falls, suspending the NASCAR Nationwide auto race on Saturday, March 1, 2014, in Avondale, Ariz. (AP Photo/Ross D. Franklin)
FILE - In this Feb. 23, 2014 file photo, Dale Earnhardt Jr. celebrates in Victory Lane after winning the NASCAR Daytona 500 Sprint Cup series auto race at Daytona International Speedway in Daytona Beach, Fla. As NASCAR heads West for a two-race swing through Phoenix and Las Vegas, the challenge becomes duplicating the Daytona 500 so that the remaining 36 events are half as exciting. (AP Photo/Terry Renna, File)
Driver Tony Stewart greets fans as he is introduced before the NASCAR Daytona 500 Sprint Cup series auto race at Daytona International Speedway in Daytona Beach, Fla., Sunday, Feb. 23, 2014. (AP Photo/John Raoux)
10ThingstoSeeSports - Dale Earnhardt Jr. emerges from a cloud of smoke after winning the NASCAR Daytona 500 auto race at Daytona International Speedway in Daytona Beach, Fla., Sunday, Feb. 23, 2014. (AP Photo/Phelan M. Ebenhack, File)
Dale Earnhardt Jr., front, leads the racers to the finish line as Kyle Busch (18) starts a collision coming out of Turn 4 during the NASCAR Daytona 500 auto race at Daytona International Speedway in Daytona Beach, Fla., Sunday, Feb. 23, 2014. (AP Photo/Phelan M. Ebenhack)
Kelley Earnhardt Miller, right, celebrates after her brother, Dale Earnhardt Jr, wins the NASCAR Daytona 500 Sprint Cup series auto race at Daytona International Speedway in Daytona Beach, Fla., Sunday, Feb. 23, 2014. (AP Photo/Terry Renna)