Joe Biden's search for a running mate enters final stretch

As Joe Biden nears the announcement of his vice presidential choice, the top contenders and their advocates are making final appeals.The campaign hasn't finalized a date for naming a running mate, but three people who spoke on condition of anonymity to discuss the plans said a public announcement likely wouldn't happen before the week of Aug. 10.Biden said in May that he hoped to name his pick around Aug. 1 and told reporters this week that he would “have a choice in the first week of Augu