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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 Kevin Harvick, driver of the #29 Budweiser Chevrolet, lead the field 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

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