Sat Sep 27, 8:08 PM ET
Democratic presidential candidate Sen. Barack Obama, D-Ill., left, and his vice presidential running mate Sen. Joe Biden, D-Del., wave to the crowd as they arrive for a rally at the University of Mary Washington in Fredericksburg, Va., Saturday, Sept. 27, 2008.(AP Photo/Steve Helber)
Sat Sep 27, 8:09 PM ET
Democratic presidential candidate Sen. Barack Obama, D-Ill.,right, and his vice presidential running mate Sen. Joe Biden, D-Del., wave to the crowd as they arrive for a rally at the University of Mary Washington in Fredericksburg, Va., Saturday, Sept. 27, 2008.(AP Photo/Steve Helber)
Sat Sep 27, 8:20 PM ET
Democratic presidential candidate Sen. Barack Obama, D-Ill., waves to the crowd after a speech at the University of Mary Washington in Fredericksburg, Va., Saturday, Sept. 27, 2008.(AP Photo/Steve Helber)
Sat Sep 27, 8:22 PM ET
Democratic presidential candidate Sen. Barack Obama, D-Ill., speaks during a rally at the University of Mary Washington in Fredericksburg, Va., Saturday, Sept. 27, 2008.(AP Photo/Steve Helber)
Sat Sep 27, 8:36 PM ET
Democratic presidential candidate Sen. Barack Obama D-Ill., listens as he is introduced by Democratic vice presidential candidate Sen. Joe Biden, D-Del., at a rally at the University of Mary Washington in Fredericksburg, Va. Saturday, Sept. 27, 2008.(AP Photo/Alex Brandon)
Sat Sep 27, 8:38 PM ET
In pouring rain, Democratic presidential nominee Senator Barack Obama (D-IL) (L) and his vice presidential running mate Senator Joe Biden (D-DE) wave to supporters during a campaign rally at the University of Mary Washington in Fredericksburg, Virginia September 27, 2008. REUTERS/Jason Reed (UNITED STATES) US PRESIDENTIAL ELECTION CAMPAIGN 2008(USA)
Sat Sep 27, 8:48 PM ET
Democratic presidential nominee Senator Barack Obama (D-IL) (L) and his vice presidential running mate Senator Joe Biden (D-DE) shake hands on stage during a rain shower at a campaign rally at the University of Mary Washington in Fredericksburg, Virginia, September 27, 2008. REUTERS/Jason Reed (UNITED STATES) US PRESIDENTIAL ELECTION CAMPAIGN 2008(USA)
Sat Sep 27, 8:53 PM ET
Democratic presidential candidate Sen. Barack Obama D-Ill., listens as he is introduced by Democratic vice presidential candidate Sen. Joe Biden, D-Del., at a rally at the University of Mary Washington in Fredericksburg, Va. Saturday, Sept. 27, 2008.(AP Photo/Alex Brandon)
Sat Sep 27, 8:54 PM ET
Democratic presidential candidate Sen. Barack Obama D-Ill., listens as he is introduced by Democratic vice presidential candidate Sen. Joe Biden, D-Del., at a rally at the University of Mary Washington in Fredericksburg, Va. Saturday, Sept. 27, 2008.(AP Photo/Alex Brandon)
Sat Sep 27, 8:55 PM ET
Democratic presidential candidate Sen. Barack Obama D-Ill., listens as he is introduced by Democratic vice presidential candidate Sen. Joe Biden, D-Del., at a rally at the University of Mary Washington in Fredericksburg, Va. Saturday, Sept. 27, 2008.(AP Photo/Alex Brandon)
Sat Sep 27, 8:57 PM ET
Democratic presidential nominee Senator Barack Obama (D-IL) (R) and his vice presidential running mate, Senator Joe Biden (D-DE) arrive at a campaign rally at the University of Mary Washington in Fredericksburg, Virginia, September 27, 2008. REUTERS/Jason Reed (UNITED STATES) US PRESIDENTIAL ELECTION CAMPAIGN 2008 (USA)
Sat Sep 27, 8:57 PM ET
Democratic presidential candidate Sen. Barack Obama D-Ill., listens as storm clouds gather, as he is introduced by Democratic vice presidential candidate Sen. Joe Biden, D-Del., at a rally at the University of Mary Washington in Fredericksburg, Va. Saturday, Sept. 27, 2008.(AP Photo/Alex Brandon)
Sat Sep 27, 9:07 PM ET
Democratic presidential nominee Senator Barack Obama (D-IL) is introduced by his vice presidential running mate, Senator Joe Biden (D-DE) during a campaign rally at the University of Mary Washington in Fredericksburg, Virginia, September 27, 2008. REUTERS/Jason Reed (UNITED STATES) US PRESIDENTIAL ELECTION CAMPAIGN 2008(USA)
Sat Sep 27, 9:07 PM ET
Democratic presidential nominee Senator Barack Obama (D-IL) (facing camera) speaks to his vice presidential running mate Senator Joe Biden (D-DE) during a campaign rally at the University of Mary Washington in Fredericksburg, Virginia, September 27, 2008. REUTERS/Jason Reed (UNITED STATES) US PRESIDENTIAL ELECTION CAMPAIGN 2008(USA)
Sat Sep 27, 9:07 PM ET
Democratic presidential nominee Senator Barack Obama (D-IL) is introduced by his vice presidential running mate, Senator Joe Biden (D-DE) during a campaign rally at the University of Mary Washington in Fredericksburg, Virginia, September 27, 2008. REUTERS/Jason Reed (UNITED STATES) US PRESIDENTIAL ELECTION CAMPAIGN 2008(USA)
Sat Sep 27, 9:09 PM ET
Democratic presidential nominee Senator Barack Obama (D-IL) is introduced by his vice presidential running mate Senator Joe Biden (D-DE) (not pictured) during a campaign rally at the University of Mary Washington in Fredericksburg, Virginia, September 27, 2008. REUTERS/Jason Reed (UNITED STATES) US PRESIDENTIAL ELECTION CAMPAIGN 2008(USA)