Concern over safety violations at West Virginia mine as rescue continues

Rescuers trying to reach four missing miners after an explosion at a West Virginia coal mine are retreating today. The state's governor, Joe Manchin,  said noxious gas levels were still too high and the rescuers had to turn back. It has been four days since Monday’s violent explosion killed 25 people at the Big Branch Mine. The coal mine, owned by Massey Energy, has multiple federal violations. In fact, two safety violations were made against the mine on the very day of the deadly explosion. Workers at Big Branch Mine were not unionized and, as Karen Miller reports, critics say miners without union representation could be at more of a risk.