Mitt Romney speaks Thursday at American Legion Post 176 in Springfield, Va. Alex Wong/Getty Images hide caption

itoggle caption Alex Wong/Getty Images

Shipping containers sit at a port in Tianjin, China, on Feb. 28. Alexander F. Yuan/AP hide caption

itoggle caption Alexander F. Yuan/AP

Attendees at Monday's Mitt Romney rally in Mansfield, Ohio, recite the Pledge of Allegiance. Charles Dharapak/AP hide caption

itoggle caption Charles Dharapak/AP