Vice President Joe Biden said Saturday that the United States can now focus on new global challenges after a long decade of war in an election-year commencement address to jubilant graduates of the U.S. Military Academy at West Point. "Winding down these longs wars has enabled us to replace and rebalance our foreign policy," Biden told the Army cadets and their families at the storied academy's football stadium. Biden's speech echoed some of the themes of military success struck by President Barack Obama in his commencement address at the U.S. Air Force Academy last Wednesday. Biden, like Obama, said U.S....