The U.S. House of Representatives will forge ahead with a vote on blocking an Arab-owned company from managing U.S. ports, to ensure the firm sheds its U.S. holdings as promised, a leadership spokesman said on Friday. The Republican-run House's refusal to back away from the showdown vote was another blow to President George W. Bush, who suffered a stinging defeat on Thursday when Dubai Ports World said it intended to back out of the deal his administration had approved. Reverberations from the political earthquake continued on Friday. The United Arab Emirates broke off talks on a free trade pact with...