Fri Aug 22, 10:37 PM ET
US Democratic presidential candidate Sen. Barack Obama (D-IL) (L) and Sen. Joe Biden (D-DE) talk before the AFL-CIO Presidential Forum at Soldier Field in Chicago in this August 7, 2007 file photo. Obama prolonged the suspense over his vice presidential pick on August 22, 2008, saying he had chosen an independent voice who could be an effective governing partner -- but not announcing the name. Biden, who has deep foreign policy credentials, emerged as a strong possibility after two others believed to be among the finalists reportedly were told they would not be selected. Picture taken August 7, 2007. REUTERS/John Gress/Files (UNITED STATES) US PRESIDENTIAL ELECTION CAMPAIGN 2008(USA)
Sat Aug 23, 12:59 AM ET
Senate Foreign Relations Committee Chairman Sen. Joseph Biden, D-Del., left, talks with committee member, and Democratic presidential hopeful Sen. Barack Obama, D-Ill., on Capitol Hill in Washington, in this Tuesday, April 8, 2008 file photo. Sen. Joe Biden of Delaware is Barack Obama's pick as vice presidential running mate, The Associated Press has learned Saturday Aug. 23, 2008.(AP Photo/Pablo Martinez Monsivais, FILE)
Sat Aug 23, 1:00 AM ET
Democratic presidential hopefuls Sen. Barack Obama, D-Ill., left, laughs with Sen. Joseph Biden, D-Del., before the start of a presidential forum hosted by the AFL-CIO at Soldier Field in Chicago, in this Tuesday, Aug. 7, 2007 file photo. Sen. Joe Biden of Delaware is Barack Obama's pick as vice presidential running mate, The Associated Press has learned Saturday Aug. 23, 2008.(AP Photo/Charles Rex Arbogast, FILE)
Sat Aug 23, 1:19 AM ET
Sen. Joe Biden, D-Del., left, talks with Sen. Barack Obama, D-Ill., prior to the start of the first Democratic presidential primary debate of the 2008 election hosted by the South Carolina State University in Orangeburg, SC., in this April 26, 2007 file photo. Barack Obama selected Sen. Joe Biden of Delaware late Friday night Aug. 22, 2008 to be his vice presidential running mate, according to a Democratic official, balancing his ticket with an older congressional veteran well-versed in foreign and defense issues.(AP Photo/J. Scott Applewhite, File)
Sat Aug 23, 1:20 AM ET
ADDS DATE OF SELECTION Presidential hopeful, Sen. Joseph Biden, D-Del., speaks with Sen. Barack Obama, D-Ill., at the Sisters on Target banquet in Des Moines, Iowa, in this Saturday, Oct. 13, 2007 file photo. Barack Obama selected Sen. Joe Biden of Delaware late Friday night aUG. 22, 2008 to be his vice presidential running mate, according to a Democratic official, balancing his ticket with an older congressional veteran well-versed in foreign and defense issues.(AP Photo/Kevin Sanders, FILE)
Sat Aug 23, 6:39 AM ET
Democratic presidential candidate Barack Obama (left) shakes hands with Joe Biden before a meeting of the Senate Foreign Relations Committee in April 2008. Obama has named Biden as his vice presidential running mate.(AFP/File/Paul J. Richards)