Millions brace for crippling ice and dangerous tornadoes

Powerful storms are expected to bring snow, ice, flooding and possibly tornadoes to tens of millions of people across the United States. CNN's Karen Maginnis reports.

Millions brace for crippling ice and dangerous tornadoes
Powerful storms are expected to bring snow, ice, flooding and possibly tornadoes to tens of millions of people across the United States. CNN's Karen Maginnis reports.