Joe Biden, right, a Democratic senator from Delaware and vic

UNITED STATES – AUGUST 27: Joe Biden, right, a Democratic senator from Delaware and vice presidential running mate of presidential candidate Senator Barack Obama of Illinois, walks with his son Joseph “Beau” Biden, attorney general of Delaware, on day three of the Democratic National Convention (DNC) in Denver, Colorado, U.S., on Wednesday, Aug. 27, 2008. The DNC ends on Aug. 28. (Photo by Matthew Staver/Bloomberg via Getty Images)