Former Massachusetts Gov. Mitt Romney and his aides have struggled to respond consistently to intensifying criticism about his tenure at Bain Capital and how it would be reflected in his presidency. President Obama sharply attacked Mr. Romney's business career Monday. (Associated Press)

Former Massachusetts Gov. Mitt Romney and his aides have struggled to respond consistently to intensifying criticism about his tenure at Bain Capital and how it would be reflected in his presidency. President Obama sharply attacked Mr. Romney's business career Monday. (Associated Press)