Republican presidential candidate, former Massachusetts Gov. Mitt Romney walks through the garage area during a rain delay before the start of the NASCAR Sprint Cup Series Federated Auto Parts 400 at Richmond International Raceway on September 8, 2012 in Richmond, Virginia.

Republican presidential candidate, former Massachusetts Gov. Mitt Romney walks through the garage area during a rain delay before the start of the NASCAR Sprint Cup Series Federated Auto Parts 400 at Richmond International Raceway on September 8, 2012 in Richmond, Virginia.

Republican presidential candidate, former Massachusetts Gov. Mitt Romney walks through the garage area during a rain delay before the start of the NASCAR Sprint Cup Series Federated Auto Parts 400 at Richmond International Raceway on September 8, 2012 in Richmond, Virginia.

Republican presidential candidate, former Massachusetts Gov. Mitt Romney walks through the garage area during a rain delay before the start of the NASCAR Sprint Cup Series Federated Auto Parts 400 at Richmond International Raceway on September 8, 2012 in Richmond, Virginia.

Republican presidential candidate, former Massachusetts Gov. Mitt Romney walks through the garage area during a rain delay before the start of the NASCAR Sprint Cup Series Federated Auto Parts 400 at Richmond International Raceway on September 8, 2012 in Richmond, Virginia.

Republican presidential candidate, former Massachusetts Gov. Mitt Romney walks through the garage area during a rain delay before the start of the NASCAR Sprint Cup Series Federated Auto Parts 400 at Richmond International Raceway on September 8, 2012 in Richmond, Virginia.

Republican presidential candidate, former Massachusetts Gov. Mitt Romney walks through the garage area during a rain delay before the start of the NASCAR Sprint Cup Series Federated Auto Parts 400 at Richmond International Raceway on September 8, 2012 in Richmond, Virginia.

Republican presidential candidate, former Massachusetts Gov. Mitt Romney walks through the garage area during a rain delay before the start of the NASCAR Sprint Cup Series Federated Auto Parts 400 at Richmond International Raceway on September 8, 2012 in Richmond, Virginia.

Republican presidential candidate, former Massachusetts Gov. Mitt Romney walks through the garage area during a rain delay before the start of the NASCAR Sprint Cup Series Federated Auto Parts 400 at Richmond International Raceway on September 8, 2012 in Richmond, Virginia.