Democratic vice presidential candidate, Sen. Joe Biden, D-Del., poses with a supporter after he attended a rally at the University of Florida in Gainesville, Sunday, Nov. 2, 2008.
Democratic candidate for vice president, Sen. Joe Biden, D-Del., speaks at a campaign rally at the University of Delaware in Newark, Del., Friday Oct. 31, 2008.
Democratic vice-presidential candidate Sen. Joe Biden, D-Del., claps along with his supporters as he arrives to speak at a campaign rally, Thursday, Oct. 30, 2008, at Fox High School in Arnold, Mo.
Vice presidential candidate Sen. Joe Biden, D-Del., makes a point before introducing presidential candidate Sen. Barack Obama, D-Ill., during a rally at the Bank Atlantic Center in Sunrise, Fla., Wednesday, Oct. 29, 2008.
Democratic vice presidential candidate, Sen. Joe Biden, D-Del., speaks at a rally at the Dancing Horse Farm in Ocala, Fla., Tuesday, Oct. 28, 2008.
Democratic vice presidential candidate, Sen. Joe Biden, D-Del., speaks during a campaign rally at East Carolina University in Greenville, N.C., Monday, Oct. 27, 2008.
Democratic vice presidential candidate, Sen. Joe Biden, D-Del., speaks at a campaign stop at the University of Northern Colorado in Greeley, Colo., on Tuesday, Oct. 21, 2008.
Democratic vice presidential candidate, Sen. Joe Biden, D-Del., speaks during a campaign rally at Cheney Stadium in Tacoma, Wash. Sunday, Oct. 19, 2008.
Democratic vice presidential candidate, Sen. Joe Biden, D-Del., speaks during a campaign rally in Henderson, Nev., on Friday, Oct. 17, 2008.
Democratic vice presidential candidate, Sen. Joe Biden, D-Del., speaks during a campaign rally in Henderson, Nev., on Friday, Oct. 17, 2008.
Democratic vice presidential candidate, Sen. Joe Biden, D-Del., speaks at a campaign rally in Manchester, N.H., Monday, Oct. 13, 2008.
Democratic vice presidential candidate, Sen. Joe Biden, D-Del., fires up the crowd during a campaign stop in Rochester, N.H., Monday, Oct. 13, 2008.
Democratic vice presidential candidate, Sen. Joe Biden, D-Del., left, poses for a photo with a supporter after a campaign rally in downtown Springfield, Mo., Friday, Oct. 10, 2008.
Democratic vice presidential candidate Sen. Joe Biden, D-Del. works the rope line following his speech at a rally in St. Joseph, Mo., Thursday, Oct. 9, 2008.
Democratic vice presidential candidate, Sen. Joe Biden, D-Del., speaks during a rally in Liberty, Mo., Thursday, Oct. 9, 2008.