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Kobalt Tools 400

LAS VEGAS, NV - MARCH 11: Dale Earnhardt Jr., driver of the #88 National Guard/Diet Mountain Dew Chevrolet, and Carl Edwards, driver of the #99 Aflac Ford, lead a group of cars during the NASCAR Sprint Cup Series Kobalt Tools 400 at Las Vegas Motor Speedway on March 11, 2012 in Las Vegas, Nevada. (Photo by Todd Warshaw/Getty Images for NASCAR)

NASCAR: Kobalt Tools 400

January 1, 1970

All the action from the Kobalt Tools 400 in Las Vegas.