Are U.S. and Iran Veering Toward War?

Aired: 1/18/2012 | 0:09:08 | Clip
Riding on more sanctions and rhetoric, tensions between the U.S. and Iran continue to escalate. Margaret Warner discusses whether the U.S. and Iran appear to be sliding into war with Tufts University's Vali Nasr and Dennis Ross, who served in the National Security Council and State Department in four administrations.