I hope he’s serious:

If elected, Mr. Obama said, he would lead a global effort to secure nuclear weapons and material at vulnerable sites within four years. He also will pledge to end production of fissile material for weapons, agree not to build new weapons and take remove any remaining nuclear weapons from hair-trigger alert.

It’s not just Iran that has no business wielding nuclear weapons.  No one on this planet should have the power to ruin the entire planet for the rest of us.