Democratic presidential candidate, Sen. Barack Obama, D-Ill., second from left, talks with panelists at a roundtable discussion on nuclear non-proliferation held at Purdue University in West Lafayette, Ind., Wednesday, July 16, 2008. At left is Sen. Evan Bayh, D-Ind. Obama said Wednesday that two goals of his administration would be to secure all loose nuclear material during his first term and to ultimately rid the world of nuclear weapons.
