Tornadoes across four Southern states tore through homes, ripped the roof off a shopping mall and blew apart warehouses in a rare spasm of violent winter weather that killed at least 22 people and injured dozens more. The twisters that slammed Arkansas, Mississippi, Tennessee and Kentucky were part of a line of storms that raged across the nation's midsection at the end of a day of Super Tuesday primaries in several states. Candidates including Hillary Rodham Clinton, Barack Obama and Mike Huckabee even paused their victory speeches to remember the victims.
