Tony Stewart wins at Las Vegas
Kobalt Tools 400
Credit: Getty Images for NASCAR
LAS VEGAS, NV - MARCH 11: Mark Martin, driver of the #55 Aaron's Dream Machine Toyota, leads 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 Ronald Martinez/Getty Images for NASCAR)
