In this Wednesday, Aug. 27, 2008 file photo, Delaware Attorney General Beau Biden introduces his father at the Democratic National Convention in Denver. (AP Photo/Paul Sancya)
Vice President Joe Biden, right, holds his grandson Hunter next to his son, Beau, while watching a second-round game between Delaware and North Carolina. (AP Photo/ Patrick Semansky)
President Barack Obama, center and Beau Biden, Attorney of Deleware, right, watch as his father Joe Biden is sworn in at the ceremonial swearing-in. (AP Photo/ Pablo Martinez Monsivais)
Beau Biden, Attorney General of Delaware and son of Vice President Joe Biden nominates his father for the Office of Vice Presdient of the United States. (AP Photo/ J. Scott Applewhite)
Delaware Attorney General Beau Biden, D-Del., celebrates his re-election with his wife, Hallie, during a Democratic election night rally in Wilmington, Del., Tuesday, Nov. 2, 2010. (AP Photo/ Susan Walsh)
Delaware Attorney General Beau Biden, right, talks with Col. Robert Coupe at a Delaware State Police Promotion Ceremony in Dover, Del., Wednesday, Aug. 11, 2010. (AP Photo/ Ann Heisenfelt)
Delaware Attorney General Beau Biden responds to a question during an interview with the Associated Press in Dover, Del., Wednesday, Aug. 11, 2010. (AP Photo/ Ann Heisenfelt)
Capt. Beau Biden carries his son Hunter, 3, on his shoulders after an official welcome home ceremony for members of the Delaware Army National Guard 261st Signal Brigade. (AP Photo/ Rob Carr)
U.S. Vice President Joe Biden, right, talks with his son, U.S. Army Capt. Beau Biden, at Camp Victory on the outskirts of Baghdad, Iraq, Saturday, July 4, 2009. (AP Photo/ Khalid Mohammed)
The younger Biden was a lawyer, member of the Delaware National Guard and former Delaware attorney general. He was 46.