Republican presidential candidate, former Massachusetts Gov. Mitt Romney, right, walks with driver Brian Vickers, left, as they pass a race car sponsored by Romney's rival Rick Santorum before the NASCAR Daytona 500 Sprint Cup series auto race at Daytona International Speedway in Daytona Beach, Fla., Sunday, Feb. 26, 2012. (AP Photo/Terry Renna)

Associated Press
Republican presidential candidate, former Massachusetts Gov. Mitt Romney, right, walks with driver Brian Vickers, left, as they pass a race car sponsored by Romney's rival Rick Santorum before the NASCAR Daytona 500 Sprint Cup series auto race at Daytona International Speedway in Daytona Beach, Fla., Sunday, Feb. 26, 2012. (AP Photo/Terry Renna)
Republican presidential candidate, former Massachusetts Gov. Mitt Romney, right, walks with driver Brian Vickers, left, as they pass a race car sponsored by Romney's rival Rick Santorum before the NASCAR Daytona 500 Sprint Cup series auto race at Daytona International Speedway in Daytona Beach, Fla., Sunday, Feb. 26, 2012. (AP Photo/Terry Renna)
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