Is the U.S. on track to an agreement with Iran?

Article excerpt

A U.S. official expressed 80, 85% confidence that a nuclear deal with Iran could be finalized within days, though gaps remain between the two nations' positions. Washington and Tehran have articulated different terms for what an agreement would entail, leaving room for last-minute disagreements to derail negotiations. CBS News political reporter Zak Hudak reports on the fragile state of talks as both sides edge closer to a potential accord.