Vice President Joe Biden speaks at the University of Pennsylvania's School of Social Policy and Practice commencement ceremony Monday, May 17, 2010, in Philadelphia. Biden's daughter, Ashley Biden, graduated with a Master of Social Work. (AP Photo/Charles Fox, Pool)
May 18, 2010 4:12:18 AM PDT
PHILADELPHIA - May 18, 2010 --
Vice President Joe Biden is urging graduating University of Pennsylvania students to remain optimistic in the face of two wars, high unemployment and budget cuts.